Previous PageTable Of ContentsNext Page

Trends in on-farm performance testing of cattle and sheep in sub-Saharan Africa

K. J. PETERS and W. THORPE
International Livestock Centre for Africa
P.O.Box 5689, Addis Ababa, Ethiopia
(Accepted for publication in November 1989)

Summary

THIS PAPER reviews the need for, and the objectives of, performance testing in the African production environment. The zonal distribution of cattle and sheep populations is discussed, and the major factors limiting animal performance are highlighted. Past, present and future trends in performance testing are then assessed and the advantages and disadvantages of on-farm and on-station performance recording are evaluated.

Introduction

Sub-Saharan Africa has a great need and considerable potential for increased production from cattle and sheep. Both species are functionally integrated into farming systems, and there is a clear association between particular breed populations and particular ecological environments. Before animal performance under the prevailing ecological and economic conditions can be improved, detailed information is needed on the specific functions of cattle and sheep in production systems, on their performance potential under different levels of management, and on the current disease situation and feed availability. Such information can be obtained through livestock performance testing on stations and on farms.

This paper summarises past and present experiences with livestock performance testing in sub-Saharan Africa and outlines the role of networks in improving on-farm testing through the use of standardised testing methods and rapid data handling and feedback.

Cattle and sheep production systems

Populations

Sub-Saharan Africa is a diverse ecological environment comprising arid and semi-arid rangelands, subhumid and humid lowlands and temperate highlands, and characterised by an association of specific breed types with particular ecological zones. The distribution of cattle and sheep populations by zone is shown in Table 1, the highest concentrations of these species being in the drier and highland areas.

Table 1. Distribution of cattle and sheep populations by ecological zone in sub-Saharan Africa (SSA).

Zone

Land area (% of SSA)

Cattle (%)

Sheep (%)

Arid

36

20.7

35.7

Semi-arid

18

30.6

22.2

Subhumid

22

22.7

13.6

Humid

19

6.1

7.9

Higland

5

19.9

20.6

Source: Jahnke (1982).

About 75% of all livestock in sub-Saharan Africa are kept by smallholders (agropastoralists or mixed crop–livestock farmers), about 20% by pastoralists and only 5% on ranches. African livestock production systems are directed towards economic security and food production. Smallholders and pastoralists aim at maximising returns per unit land area, rather than returns per animal. Specialised production systems are gradually appearing, but only in ecologically and economically favourable areas such as the Kenyan highlands. Most specialised herds are very small, which considerably limits opportunities for within-herd selection.

Livestock have diverse economic and social functions in African farming systems. They provide foods, inputs to crop production in the form of traction and manure, and fibre and skins. Contrary to common belief, most livestock production systems in sub-Saharan Africa are output oriented and cannot be depicted as merely subsistence systems (SEDES/INSEE, 1966; Eddy, 1979; White and Meadows, 1981; Sempeho, 1985; Gryseels, 1988; Danckwerts, n. d.). Animal traction, for example, accounts for about 40% of the gross value of food and non-food outputs of cattle, beef accounts for about 35%, milk for about 20% and manure for about 5% (S. Sandford, ILCA, Addis Ababa, Ethiopia, personal communication).

Performance

Cattle. African cattle can be classed into four major types: the fairly large North Sudan Zebu, the Small East African Zebu, the Sanga of the south and the taurine breeds in West and central Africa (Epstein, 1971). These populations were selected for their multipurpose performance and ability to cope with environmental stress. When raised under extensive management with few external inputs, their performance is characterised by slow juvenile growth, late sexual maturity, long calving intervals and generally modest milk yields (Wilson, 1983; Trail, 1985; de Leeuw, 1986; Otchere, 1986; Wagenaar et al, 1986).

Breed differences seem to be less important for the productivity of African cattle than environmental and management influences. Major production constraints are associated with management and husbandry, the nutrition × disease complex and the seasonality of feed availability, especially in the traditional system with communal grazing. A comparison of all outputs from cattle in Botswana's traditional system and calf weight only from ranches showed that the traditional system is almost twice as productive in liveweight equivalents (9.91 kg/ha/year) as ranching (5.01 kg/ha/year) (de Ridder and Wagenaar, 1984).

Sheep. These are classed into four main types: the small, thin-tailed hair sheep of West and central Africa, the large, thin-tailed hair sheep in the Sahel, the fat-rumped Somali sheep and the fat-tailed hair sheep of East and southern Africa (Ryder, 1984).

Because of the long-term adaptation of sheep to specific environments, their performance matches production conditions. Most sheep in sub-Saharan Africa are aseasonal breeders, and some are also highly fecund. Overall productivity per ewe is largely determined by natural production conditions, but even under unfavourable conditions sheep are more productive on the basis of body weight than cattle (Wilson, 1982; Armbruster, 1987).

The major constraint on sheep productivity is high reproductive wastage (up to 40%) which greatly reduces selection possibilities. More frequent lambing and lower mortality thus need to be emphasised, while increased litter size and growth rate are of lesser importance (Peacock, 1985; Armbruster, 1987).

Management practices strongly influence sheep performance, the differences between flocks exceeding 200% (Peacock, 1987). Reduced performance is often due to a combination of nutrition and disease/ parasite problems which could be tackled through better management. Therefore, a careful analysis of management practices under all production circumstances is desirable.

Performance testing

Needs and objectives

Performance testing is a goal-oriented, systematic process of collecting and analysing data on economically important performance traits and management practices under defined production conditions. The objectives of performance testing are to:

Performance testing is useful and justified only if results are made available to those engaged in livestock breeding and development, i.e. farmers, extension agents, researchers and policy makers.

Approaches to performance testing

The significant long-term effects of management on animal performance, and the immediate impact of improved husbandry, hygiene and feeding, underline the need for on-farm testing. Collecting information on animal performance on the farm makes it possible to identify production prospects, as well as different management variables and their effects on the production process. It is also helpful in identifying problem areas needing more in-depth assessment of cause-effect relationships and production aspects in which improvements can be made (Figure 1).

Figure 1. Complementarity of on-farm and on-station testing.

Data on individual reproduction and production traits are required to assess herd/flock productivity and phenotypic variation of traits. However, genetic parameters can only be estimated under controlled breeding, which is difficult to implement on farms because of the small size of farm flocks/herds and mixed herding on communal pastures.

On-farm performance testing provides information on location-specific production conditions and location-specific performance of individual animals or breeds, as well as on breed improvement options appropriate to particular systems. Breed comparisons and assessment of specific performance abilities are essential for evaluating the relative merits of breeds, but these tests are unlikely to be implemented on the farm because they require many animals of several breeds over several years to assess production potential in a single environment.

These conditions are fulfilled in complementary livestock on-station tests, as was demonstrated by the classical beef-cattle breed comparisons implemented in Botswana and Zimbabwe (APRU, 1986; Tawonezvi, 1987; Ward, 1987). On-station trials are required to assess responses of animals to improved management and feeding. However, their accuracy, and hence their relevance to subsequent on-farm performance recording, is usually influenced by genotype × environment interactions.

Trends in performance testing

Past performance testing

A comprehensive review of cattle breed studies in Africa by Trail (1981) listed 500 papers published between 1949 and 1978. Of these, only 20% gave comparative information on two or more breeds and only 5% included information which allowed breed comparisons based on productivity indices. The majority of the papers (56%) related to indigenous cattle breeds, 30% were on crossbreeds and 14% on exotic breeds. Growth was measured in 72% of the papers, reproductive performance in 41%, milk production in 33% and viability in only 18% of the papers. The review did not cover management × animal performance interactions, but there is considerable evidence that one of the most important objectives of performance testing – improved management and production efficiency – received little attention in early testing activities.

Searches on ILCA's in-house database, the FAO Agricultural Information System (AGRIS) and the database of the Commonwealth Agricultural Bureaux International (CABI) identified references to a further 139 studies of on-farm and on-station performance testing of cattle and small ruminants carried out in sub-Saharan Africa between 1978 and 1987 (see Separate Bibliography).

As expected, the number of references found reflected the relative sizes of regional livestock populations: the most numerous were references from East and southern Africa, followed by references from West and central Africa. Predictably, references to cattle (85) outnumbered those to small ruminants (54). For both cattle and small ruminants, on-station testing (47 and 33 studies, respectively) was reported more frequently than on-farm testing (38 and 21 studies).

On-station studies were mainly experimental, while on-farm studies were predominantly diagnostic, aimed at assessing non-genetic constraints to production but often covering only a limited number of factors. Health status was seldom recorded on-station; when it was recorded on-farm, it was not evaluated in relation to performance. More than half of the reports were short-term studies during which it is not possible to assess reproductive performance and viability, nor, for that matter, to evaluate animal productivity and the relative importance of its components.

Objectives. The principal objectives of performance recording on stations and on farms were different and depended on the duration of the study. Short-term experimental and diagnostic studies on stations and all diagnostic testing programmes on farms were aimed at assessing non-genetic factors (excluding disease) and their effects on performance. Genetic factors generally received little attention. This contrasted with the majority of medium- and long-term on-station experiments which were mainly concerned with breed evaluation and related genetic research.

The objective of most on-farm studies was systems analysis to identify non-genetic husbandry constraints; only a small proportion investigated possibilities for genetic improvement. Data on genetic improvement usually came from large-scale commercial farms. Two long-term on-station/ on-ranch breed performance comparisons specifically highlighted the need to evaluate indigenous breeds before embarking on crossbreeding programmes. One of them was done in Zimbabwe, and compared the indigenous Tuli, Nkone and Mashona breeds with Africander, Brahman, Sussex and Charolais cattle (Ward, 1987). The other was done in Botswana by the Animal Production Research Unit and compared the local Tuli and Tswana breeds with Africander (Buck et al, 1982). Both studies indicated the outstanding overall performance of indigenous breeds in beef production.

Implementation. On-station studies were usually financed and executed by the relevant ministries of national governments, with occasional assistance from donor agencies. National governments were also the main source of reports on short- and medium-term studies.

Most long-term studies on-station involved international agencies, such as the International Livestock Centre for Africa (ILCA). The Centre has been a major executing agency for long-term systems studies published in the 1980s, which reflect the change in emphasis from on-station performance testing to on-farm research, stimulated principally by collaborating agencies.

Relevance to production systems. On-station production systems described in the literature invariably include husbandry methods which are not used in the traditional system, such as routine disease control, exotic breeds, restricted breeding season, planted forages and fencing. The experimental results were therefore more relevant to commercial farms than to the predominant traditional sector. Moreover, because of administrative constraints, on-station performance was often below expected levels.

Awareness of the need to direct research towards the prevailing production systems has increased during the past 10 years, with the result that studies now include a diagnostic stage to identify the complex factors influencing output, which is then followed by component research. The increasing number of reports describing livestock performance on farms is a direct result of this change. True on-farm performance recording has been focused on non-genetic factors, but methodologies are being developed to facilitate research on genetic improvement in production systems with small flocks and herds.

Current performance recording

Performance recording is currently being undertaken throughout sub-Saharan Africa, but small ruminant programmes, particularly those implemented on farms, are more common in West Africa, and cattle programmes are more frequent in East and southern Africa (Table 2). Most on-station work is funded and executed by national governments, whereas the majority of on-farm programmes have external participation and/or funding. Most countries have on-station comparisons of breed and crossbreed performances, and generally there are concurrent selection programmes based on the performance testing of a major local breed or breeds.

Table 2. Current programmes for on- farm and on-station performance recording.
 

Small ruminants

Cattle

On-farm

On-station

On-farm

On-station

West Africa

Benin

D+M+G*

?

?

?

Burkina Faso

D

?

?

?

Côte d'Ivoire

D+M+G*

GS

D+M*

GB+GS

Mali

D+M*

?

?

?

Niger

GS

?

GB+GS

Nigeria

?

GB+GS

?

GB+?

Senegal

D+M*

GB+GS

?

?+GS

Togo

D+M+G*

GB+GS*

?

?

The Gambia

?

?

D+M*

GS*

Central Africa

Burundi

D+M+G*

GB+GS*

?

?

Cameroon

?

GB

?

GB+GS

Congo

D*

GS*

?

?

Gabon

?

?

?

GB+GS

Rwanda

?

GB+GS

?

GB+GS

Zaire

?

?

D+M+G*

?

East Africa

Ethiopia

D+M*

GB+GS*

D*+?

GB+GS

Kenya

D+M+G*

GB+GS*

M+G

GB+GS

Somalia

D*

?

?

?

Tanzania

?

?

D+M+G

GB+GS

Southern Africa

Botswana

D+M*

GB

D+M+G*

GB+GS

Madagascar

?

?

D+M+G*

GB+GS

Malawi

?

?

D+M+G

GB+?

Mozambique

D

GB

M+G

GB+GS

Notes: An asterisk (*) indicates external agency participation and/or funding. Question mark (?) indicates a possibility that the particular research was done but was not reported in literature. Dash (-) means that the research was not carried out. D = diagnosis of technical constraints on farms; M = testing/monitoring of management improvements on farms; G = testing/monitoring of genetic improvement on farms; GB = breed comparison on stations; GS = within-breed selection on stations.

Target production systems. The target production system for on-farm performance recording is small-scale, mixed crop-livestock farming. There are two exceptions to this. One is the recording of small ruminant performance and health in the pastoral system of Somalia, which has been undertaken jointly by the Somalian Government, ILCA and GTZ since 1983 in 200 meat-producing flocks of mixed species. The other is cattle performance recording in countries, such as Kenya and Zimbabwe, which have large-scale beef or dual-purpose (milk and meat) production on ranches and in specialised dairies.

On-farm recording in national beef and dairy schemes is organised as in the developed countries. Daily records of reproductive events, milk yield and/or liveweight are kept by the farmer and these are checked monthly by staff of the coordinating institution. The main objectives of such programmes are to select replacement sires and heifers and to monitor husbandry practices. Contract matings are used to produce artificial insemination bulls.

Phases and their duration. The first phase of performance recording is diagnostic, usually lasting 2 to 3 years. Well established programmes subsequently include on-station intervention testing of 3 to 4 years, during which on farm testing of husbandry, hygiene and breeding interventions is already generally possible. On-farm testing is also backed by breed improvement programmes.

Development projects designed to introduce small-scale dairy units (e.g. in Kenya, Tanzania and Botswana) may have a reduced diagnostic phase. Interventions are tested on-station early in the programme and are released for on-farm testing when proven, which may take between 1 and 5 years. Established technologies can be transferred from other systems in similar locations at the beginning of the project. In dairy development projects, on-farm recording serves primarily the objectives of monitoring and improving management, hygiene and breeding practices. It also serves as a basis for assessing the economic efficiency of the improved livestock production subsystem and its integration into the mixed farming system.

Strategic research in collaborative networks

The preceding examples demonstrated the use of on-farm performance recording to improve location-specific livestock production systems. Other on-farm recording programmes, such as those carried out in Côte d'Ivoire, Ethiopia, Gabon, Gambia and Zaire, contribute to strategic research on animal health and production in the tsetse-infested areas of Africa. Performance recording on farms also plays a significant role in the work of the African Trypanotolerant Livestock Network which brings together scientists from national agricultural research systems (NARS) and from ILCA and the International Laboratory for Research on Animal Diseases (ILRAD) to study the complex interactions which influence trypanosomiasis and its effects on livestock performance.

The research coordinated by the network covers all the major aspects of trypanosomiasis and its control, but focuses on the use of trypanotolerant livestock. Data on tsetse parameters and animal health and production are collected monthly at various network sites, using standard techniques and procedures. These data are analysed monthly, using centralised data processing complemented by on-site computing facilities. The network's coordinating office in Nairobi is staffed by ILCA and ILRAD, and gives technical support to the national programmes through training courses, field supervision and data processing and interpretation. Progress made is assessed at periodic meetings of network collaborators, and on the basis of this assessment, protocols are modified and future research and development programmes are planned (ILCA, 1986; 1987).

The African Trypanotolerant Livestock Network is not the only collaborative research network active in sub-Saharan Africa. There are now others, such as the Small Ruminant Research Network which has collaborative programmes in Congo, Côte d'Ivoire, Ethiopia, Kenya, Mali, Somalia and Togo, and whose objective is to carry out strategic research on small ruminants in such key areas as the economics of production, breed evaluation and improvement, feeding systems, reproductive wastage, and management. Other collaborative research networks being developed by NARS in sub-Saharan Africa are the Cattle Research Network and the Animal Traction Network. As a result of these developments, on-farm recording is expected to expand rapidly in the next 5 years.

Future prospects

Complementarity of on-farm and on-station testing. Collecting, analysing and using data on technical, economic, biological and genetic parameters is the basis for improving livestock production in Africa. The information available at present is not sufficient to guide system improvement and breeding, despite the positive trend towards system-oriented, on-farm performance testing. On-farm testing programmes are difficult to implement in Africa due to infrastructural problems, lack of funds and constraints linked to the production system (Table 3). In addition, the numerous management structures, practices and skills observed in smallholder and agropastoralist systems greatly increase the number of covariates to be incorporated in the model, and this impairs continuous data recording.

Table 3. Constraints to on-farm testing of livestock performance.

Factor

Problem

Solution

Representative sample of households and animals

Covariate distribution (environment, systems, livestock production pattern)

Conduct baseline survey for sample collection

Ownership of animals

Consent to participate

Provide information on objectives of testing and feedback

Owner attitude

Identification of animals

Provide information on objectives of testing and feedback

Animal mobility

Locating herds for performance measurement

Monitor performance frequently and provide feedback

Length of production cycle

Risk of losing animals; effect of covariates

Use large sample size; estimate correction factors

Asynchronous production

Aseasonal breeding

Monitor traits at regular intervals

Management viability

Factors affecting performance

Select sufficiently large representative sample to monitor management pattern

Communal grazing

Mating structure; information on parentage

Identify paternal half-sib groups (blood grouping)

Multiple output

Multipurpose breeds

Measure different traits; assess economic importance; assign biological and economic weightings to individual outputs

Small herd/flock size

Confounded farm and animal effects (if <2 animals/class/farm); difficult simultaneous comparisons

Exclude single-animal farms; correct for farm effects; synchronise production; use grouped herd/flock comparisons

Single-sire herd/flock

Confounded sire and flock/herd effects

Use different sires or artificial-insemination group- breeding schemes

Under these circumstances, success can only be guaranteed by using large stratified samples, regular data collection and efficient data handling to give immediate feedback. Multiple outputs and small herd/flock structures constrain breed performance characterisation and evaluation and reduce the impact of genetic improvement schemes.

On-station testing (as outlined in Figure 1) can only be beneficial if on-station management practices simulate those used on the farms. Similarly, livestock on-farm testing schemes should be complemented by on-station programmes which conform with the ecological environment and management practices prevailing in the field.

Genetic improvement. Genetic improvement schemes must have a field base to be successful. Because of single-sire flocks/ herds, communal grazing and small herd/ flock sizes in the smallholder systems, group breeding schemes with open, nucleus breeding units on stations may continue to predominate in sub-Saharan Africa. Such units must be supported by effective dissemination of the selected improved stock, and of superior sires bred through artificial insemination.

On-station breeding units also may provide the centre for initial gene introduction and for rapid distribution of superior genotypes through multiple-ovulation-embryo-transfer (MOET) schemes, which, as Smith (1988) states, area model for the role of sophisticated technology in improving indigenous breeds and developing production systems. MOET schemes can achieve immediate improvement through selection of foundation animals and attain faster and more effective performance improvement rates, while being able to test for traits difficult to record in the field, such as disease tolerance and feed conversion efficiency.

Data management. Developments in computing are facilitating the handling of performance data and associated information collected in farming systems research and development programmes. Most African countries now have on-site facilities for data entry and preliminary analysis; final analyses and interpretation may, however, need to be done centrally.

Despite advances in computer technology, the lack of effective mechanisms for analysis and feedback of results and recommendations to farmers, researchers and extension agents, remains a major constraint to livestock development in sub-Saharan Africa. The objectives of performance testing can only be achieved if the collected data can be quickly analysed and interpreted and recommendations made and implemented promptly. And only then can farmers, researchers and extension agents collaborate effectively.

To facilitate this process, ILCA has developed a data entry analysis system called IDEAS, which has been distributed to more than 50 research sites in sub-Saharan Africa. IDEAS incorporates both a standardised performance recording system and an analysis system for herd management decisions, and it can interface with software for other analyses that may be required.

The importance of efficient data management and rapid feedback of results cannot be overemphasised, particularly in on-farm testing programmes. These programmes offer the possibility of effectively integrating microcomputer technology and appropriate software in livestock performance testing, thereby overcoming some of the major difficulties experienced in the past with handling field data and providing feedback.

Organisation of standardised testing. The impact of on-farm testing schemes will be measured in terms of their ability to improve livestock management and productivity. Plasse's (1982) management prerequisites to ensure successful testing programmes are rarely fulfilled under African conditions; rather, most management aspects are part of a complex exercise requiring a systems approach to performance testing if improvement possibilities are to be fully understood.

The systems approach in performance recording combines data on the farm environment (markets, services etc) with those on farm subsystems and on herds/ flocks. It requires a standardised recording approach, a predetermined data recording structure, and an efficient data handling and analysis system. Assigning the development, implementation and analysis of these tasks to collaborative research networks may speed progress, avoid duplication and attract additional funds for on-farm performance testing.

Conclusion

About 75% of Africa's livestock are in smallholder farming systems, where they fulfil several functions and are a major source of cash income. Livestock performance can be increased through improved management and output specialisation. However, the production problems identified and the improved technologies proposed must be relevant to the prevailing production system. On-farm comparative breed evaluation, as well as assessment of specific performance ability and technology development, can be complemented by on-station performance testing.

During the last decade, on-farm performance testing was expanded considerably, but on-station programmes were more widely reported. Most of the on-farm tests reported in literature were short-term studies which could not assess the whole production process and often did not match health and management data with performance.

Although on-station breed comparisons are valuable, their application is limited by high costs and genotype × environment interactions. These problems can be overcome by widespread on-farm testing within collaborative networks, based on standardised methods and enabling rapid data handling and feedback of results. Complementary on-farm and on-station performance testing organised within networks could also support genetic improvement programmes.

References

APRU (Animal Production Research Unit). 1986. Livestock and range research in Botswana 1986. APRU, Ministry of Agriculture, Gaborone, Botswana. 162 pp.

Armbruster T. 1987. La productivité de l’élevage ovin dans la région forestiére de la Côte d'Ivoire. CIPEA (Centre international pour 1'elevage en Afrique), Addis Abeba, Ethiopie. 132 pp. [ILCA library accession number 38706]

Buck N, Light D, Lethola L, Rennie T, Mlambo M and Muke B. 1982. Beef cattle breeding systems in Botswana: The use of indigenous breeds. World Animal Review 43:12–16.

Danckwerts J P. (n. d.). A socio-economic study of veld management in the tribal areas of the Victoria Province. University of Rhodesia, Department of Agriculture, Salisbury, Rhodesia. 149 pp. and app. [ILCA microfiche number 55728]

Eddy E D. 1979. Labour and land use on mixed farms in the pastoral zone of Niger: Livestock production and marketing in the Entente States of West Africa. Monograph 3. Center for Research on Economic Development, University of Michigan, Ann Arbor, Michigan, USA. 493 pp.

Epstein H. 1971. The origin of the domestic animals of Africa. Africana Publishing Corporation, New York, USA. 573 pp.

Gregory K E and Trail J C M. 1981. Rational crossbreeding with Sahiwal and Ayrshire cattle in the tropics. Journal of Dairy Science 64:1978–1984.

ILCA (International Livestock Centre for Africa). 1986. The African Trypanotolerant Livestock Network: Indications from results 1983–1985. ILCA, Addis Ababa, Ethiopia. 138 pp. [ILCA library accession number 37729

ILCA/ILRAD (International Livestock Centre for Africa/International Laboratory for Research on Animal Diseases). 1988. Livestock production in tsetse-affected areas of Africa. Proceedings of a meeting held 3–27 November 1987, Nairobi, Kenya. ILCA/ ILRAD, Nairobi, Kenya. 473 pp.

Jahnke H E. 1982. Livestock production systems and livestock development in tropical Africa. Kieler Wissenschafls-verlag Vauk, Kiel, FRG. 253 pp.

de Leeuw P N. 1986. A comparison of cattle productivity in five traditional livestock systems in sub-Saharan Africa. Paper presented to the 3rd International Symposium on Animal Production sponsored by the Deutsche Landwirtschaftsgesellschaft, Goslar, FRG, 3–7 May 1986. 14 pp.

Otchere E O. 1986. Traditional cattle production in the subhumid zone of Nigeria. In: R von Kaufmann, S Chater and R Blench (eds), Livestock systems research in Nigeria's subhumid zone. Proceedings of the Second ILCA/NAPRI Symposium held in Kaduna, Nigeria, 29 October–2 November 1984. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. pp. 110140.

Peacock C P. 1982. Seasonal breeding effects on productivity. In: R M Gatenby and J C M Trail (eds), Small ruminant breed productivity in Africa. Proceedings of a seminar held at ILCA, Addis Ababa, Ethiopia, October 1982. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. PP 77–80.

Peacock C P. 1985. Measures for assessing the productivity of sheep and goats in Africa. In: R T Wilson and D Bourzat (eds), Small ruminants in African agriculture. Proceedings of a conference held at ILCA, Addis Ababa, Ethiopia, 30 September–4 October 1985. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. pp. 128–141.

Plasse D. 1982. Performance recording of beef cattle in Latin America. World Animal Review 41:11–19.

de Ridder N and Wagenaar K T. 1984. A comparison between the productivity of traditional livestock systems and ranching in eastern Botswana. ILCA Newsletter 3(3): 5–7. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia.

Ryder M L. 1984. Sheep. In: I L Mason (ed), Evolution of domesticated animals. Longman Group Ltd, New York, USA. pp. 63–84.

SEDES/INSEE (Sociéte d'études pour le développement économique et social/ Institut national des statistiques et des études économiques). 1966. Etude démographique et économique en milieu nomade: démographie, budget et consommation. SEDES, Paris, France. 201 pp.

Sempeho G. 1985. Sheep and goats in Nigerian agriculture: Structure of small ruminant production in s. w. Nigeria and improvement possibilities. Socio-economic Studies on Rural Development 59. Edition Herodot, Gottingen, FRG. 338 pp.

Smith C. 1988. Applications of embryo transfer in animal breeding. Theriogenology 29(1): 203–212.

Tawonezvi H P R. 1987. Performance testing of Mashona cattle. In: J Grant (ed), The indigenous cattle breeds of Zimbabwe. Proceedings of a workshop held at Matopos Research Station, 26–27 February 1987. Matopos Research Station, Bulawayo, Zimbabwe. pp. 38–46.

Trail J C M. 1981. Merits and demerits of importing exotic cattle compared with the improvement of local breeds. In: A J Smith and R G Gunn (eds), Intensive animal production in developing countries. BSAP Occasional Publication No. 4. British Society of Animal Production, Thames Ditton, UK. pp. 191–231.

Trail J C M. 1985. Productivity of representative breeds of important cattle groups in Africa. In: J W Copland (ed), Evaluation of large ruminants for the tropics. Proceedings of an international workshop held at CSIRO, Rockhampton, Queensland, Australia, 1923 March 1984. ACIAR Proceedings Series No. 5. Australian Centre for International Agricultural Research, Canberra, Australia. pp.101–105.

Wagenaar K T, Diallo A and Sayers A R. 1986. Productivity of transhumant Fulani cattle in the inner Niger delta of Mali. ILCA Research Report 13, ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 57 pp.

Ward H K. 1987. Crossbreeding: The Matopos experiment. Matopos Research Station, Bulawayo, Zimbabwe. 12 pp.

White J M and Meadows S J. 1981. Evaluation of the contribution of group and individual ranches in Kajiado District, Kenya, to economic development and pastoral production strategies. Ministry of Livestock Development, Nairobi, Kenya. 127 pp. and app. Quoted in Sandford S G. 1983. Management of pastoral development in the Third World. Overseas Development Institute, London, UK. p. 124.

Wilson R T. 1983. Production animale. In: R T Wilson, P N de Leew and C de Haan (eds), Recherches sur les systèmes des zones arides du Mali: résultats préliminaires. ILCA Research Report 5, ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. pp. 63–94.

Separate bibliography

This bibliograghy includes references on livestock performance testing in sub-Saharan Africa during 1978–87 not quoted in text.

Abiye Astatke, Reed J D and Butterworth M H. 1986. Effect of diet restriction on work performance and weight loss of local Zebu and Friesian × Boran crossbred oxen. ILCA Bulletin 23:11–14. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia.

Adanse-Pipim K A. 1979. Performance of sheep fed cocoa husk-based rations in the feedlot. Report to the Department of Animal Science, University of Ghana, Accra – Legon, Ghana. 56 pp.

Addis Anteneh. 1984. Trends in sub-Saharan Africa's livestock industries. ILCA Bulletin 18:7–15. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia.

Adu I F and Buvanendran V. 1982. Pre-weaning performance of lambs from pure and crossbred matings among Nigerian breeds of sheep. World Review of Animal Production (Nigeria) 18(1): 73–77.

Adu I F, Taiwo B B A and Buvanendran V. 1985. Reproductive and lamb growth performance of Balami and Desert Sudanese sheep in the Sahelo-Sudan savanna zone of Nigeria. Journal of Animal Production Research (Nigeria) 5(1): 67–76.

Aganga A A, Oyejola B A, Aganga A O and Yaakugh I D I. 1986. Reproductive performance of White Fulani cows. Thai Journal of Agricultural Science 19(3): 225–229.

Agyemang K, Negussie Akalework, Voorthuizen A and Anderson F M. 1985. A report on a production survey of farmers' sheep flocks in Debre Berhan area of the Ethiopian highlands. Highlands Programme Working Paper. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 16 pp. [ILCA library accession number 35111]

Alberro M. 1980. Comparative performance of Holstein-Friesian, Dutch-Friesian and Friesian × Africander heifers in the coastal belt of Mozambique. Animal Production 31:43–49.

Amegee Y. 1978. Le mouton de Vogan (croisé Djallonké × Sahelien) au Togo. Annales de l'Université du Bénin, Série sciences (Togo) 4(1): 167–178.

Apambilla A C. 1980. A study on the correlation between birth weight and weaning weight and the relative performance with respect to these characters of the cattle at the Winneba Animal Husbandry Station. BSc thesis, School of Agriculture, Cape Coast University, Cape Coast, Ghana. 42 pp.

Asare E O and Wilson R T. 1985. Notes on village systems of small ruminant production in Ghana and a bibliography of Ghanaian small ruminant research. ILCA Small Ruminant and Camel Group Document SRC 5. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 20 pp.

Atou A C. 1982. Les facteurs de production bovine au ranch de Samiondji. Memoire de fin d'études, Collège polytechnique universitaire, Abomey-Calavi, Benin. 133 pp.

Auer C B. 1986. Situation actuelle, problèmes et possibilités d'amélioration de la production animale daps Z'Atacora. Communication présentee á l'occasion du Colloque sur l'amélioration de l'élevage en zone tropicale: cas de Madagascar, term à Antananarivo, 3–13 septembre 1985. 2 pp. [ILCA library accession number 35631]

Bertaudière L. 1979. Complémentation alimentaire des veaux. Essais realises au Tchad. Rapport de synthése. Institut d'élevage et de médecine vétérinaire des pays tropicaux, Maisons-Alfort, France. 72 pp.

Botswana, Ministry of Agriculture/Commission of the European Communities, European Development Fund. 1982. An evaluation of livestock management and production in Botswana with special reference to communal areas. Carl Bro International As, Malervangen, Glostrup, Denmark. Vol. 1, 77 pp.; Vol. II, 281 pp.; Vol III, 243 pp.

Bourzat D. 1984. Contribution á la connaissauce du milieu agropastoral au Yatenga en Haute-Volta, 1983–1984. Thèse de doctorat de 3e cycle, Université de Paris, Val de Marne U.E.R. Sciences/Institut d'élevage et de médecine vétérinaire des pays tropicaux, Maisons-Alfort, France. 159 pp.

Buvanendran V, Adu I F and Oyejola B A. 1981. Breed and environmental effects on lamb production in Nigeria. Journal of Agricultural Science (UK) 96:9–15.

Buvanendran V, Olayiwole M B, Pistrowska K I and Oyejola B A. 1981. A comparison of milk production traits in Friesian × White Fulani crossbred cattle. Animal Production 32:165–170.

Carew S F, Sandford J, Wissocq Y J, Durkin J W and Trail J C M. 1986. N'Dama cattle productivity at Teko Livestock Station, Sierra Leone, and initial results from crossbreeding with Sahiwal. ILCA Bulletin 23:2-10. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia.

Claus A. 1983. Evaluation des résultats obtenus daps les troupeaux temoins du CARDER Zou aprés un an de suivi. Rapport zootechnique. Ministére du développement rural et de l’action coopérative, Cotonou, Bénin. 10 pp.

Dlodlo S and Ward H K. 1987. Performance of Zimbabwe indigenous and some exotic breeds and first-cross cows in the production of crossbred progeny. In: J Grant (ed), Indigenous cattle breeds of Zimbabwe. Proceedings of a workshop held at Matopos Research Station, 26–27 February 1987. Matopos Research Station, Matopos, Zimbabwe. pp. 27–37.

El Amin F M. 1984. Performance recording of sheep in the Sudan. 1. Reproductive traits. IFS Provisional Report 14. International Foundation for Science (IFS), Stockholm, Sweden. pp. 195–203.

Fall A, Diop M, Sandford J, Wissocq Y J, Durkin J W and Trail J C M. 1982. Evaluation of the productivities of Djallonke sheep and N'Dama cattle at the Centre de recherches zootechniques de Kolda, Senegal. ILCA Research Report 3. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 74 pp.

Faugère O and Faugére B. 1986. Suivi de troupeaux et contrôle des performances individuelles des petits ruminants en milieu traditionnel africain: aspects méthodologiques. Revue d'élevage et de médecine vétérinaire des pays tropicaux 39(1): 29–40.

Fatunmbi O O and Fayemi O. 1983. Reproductive efficiency of exotic dairy cattle under tropical conditions. Revue d'élevage et de médecine vétérinaire des pays tropicaux 36(4): 403–407.

Faye A and Landais E. 1985. L'embouche bovine paysanne dans le Centre-Nord du bassin arachidier au Sénegal. In: Relations agriculture – élevage. Actes du 2e Séminaire du Département systémes agraires du Centre de coopération internationale en recherche agronomique pour le développement (CIRAD), tenu á Montpellier (France), du 10 au 13 septembre 1985. Document Systémes agraires n 4. CIRAD, Montpellier, France. pp. 304–311.

Galal E S E, Kassahun Awgichew, Beyene Kebede, Yohannes Gojjam and O'Donovan P B. 1979. A study on fattening Ethiopian sheep. 1. Performance of highland lambs under feed-lot conditions. Ethiopian Journal of Agricultural Science 1(2): 93–98.

Galal E S E, Afework Tesfazgy and Kassahun Awgichew. 1979. A study on fattening Ethiopian sheep. 2. Performance of Adal lambs on supplemented grazing. Ethiopian Journal of Agricultural Science 1(2): 99–107.

Gryseels G. 1988. Role of livestock on mixed smallholder farms in the Ethiopian highlands. A case study from the Baso and Worena Wereda near Debre Berhan. Dissertation, Agricultural University, Wageningen, The Netherlands. 249 pp.

Haumesser J B and Gerbaldi P. 1980. Observations sur la reproduction et l’élevage du mouton Oudah nigerien. Revue d'elevage et de médecine vétérinaire des pays tropicaux 33(2): 205–213.

Hendy C R C. 1980. A single-visit survey of animal performance in goat flocks of Mtwara region. In: Proceedings of the Seventh Scientific Conference of the Tanzania Society of Animal Production, Moshi, Tanzania, 26–29 May 1980. (Vol. 7) Tanzania Society of Animal Production, Morogoro, Tanzania. pp. 96–108. [ILCA accession number 30179]

Hoste C, Cloe L, Poivey J P and Deslands P.1980. Résultats zootechniques d'enquêtes ménees au Centre d'embouche bovine de Ferkessedougou, Côte d'Ivoire. Ministére de la recherche scientifique, Département Elevage, Abidjan, Côte d'Ivoire. 26 pp.

Hoste C, Baumgart J, Cloe L and Poivey J P. 1982. Analyse des performances réalisées a partir de mélasse brute de canne á sucre au Centre d'embouche bovine de Ferkessedougou, Côte d'Ivoire. 1. Premiers résultats. Revue d'elevage et de médecine vétérinaire des pays tropicatix 35(3): 265–273.

IAS/ILCA (Institute of Agricultural Sciences, Rwanda/International Livestock Centre for Africa). 1988. Productivity of Ankole cattle and their crosses with Sahiwal and Jersey at the research stations of the Institute of Agricultural Sciences, Rwanda. IAS/ILCA report. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 63 pp.

Ikhatua U J and Olayiwole M B. 1982. Seasonal effects on performance of feedlot bulls. Journal of Animal Production Research (Nigeria) 2(2): 99–111.

Iloeje M U. 1985. Heterosis from crosses among Zebu and South Devon beef cattle in southeastern Nigeria. 1. Fertility and calf performance to weaning. Journal of Animal Production Research (Nigeria) 5(2): 151–158.

Institute of Agricultural Research. 1986. Progress Report, April 1984 to March 1985. Department of Animal Science, Pasture and Forage Team, Addis Ababa, Ethiopia.

Institut sénégalais de recherches agricoles (ISRA). 1983. Point sur l’execution des programmes de recherches en 1983. Rapport du Département de recherches sur les productions et la sante animales. ISRA, Dakar, Sénegal. 36 pp.

Johnson A O and Bell T D. 1978. Comparative performance of calves from Bunaji (White Fulani) dams and Charolais, three-quarter Friesian and Bunaji sires: Journal of Agricultural Science 91:305–308.

Kabuga J D and Agyemang K. 1984. Performance of Canadian Holstein-Friesian cattle in the humid forest zone of Ghana. 2. Preweaning performance. Tropical Animal Health and Production 16(3):174–180.

Kabuga J D and Alhassan W S. 1981. The reproductive performance of a small herd of Holstein/Friesians in the humid forest zone of Ghana. World Review of Animal Production 17 (3): 41–48.

Kassahun Awgichew. 1985. The status of sheep and goat research in Ethiopia. Paper presented at the National Workshop on Livestock, Pasture and Forage Research in Ethiopia, 8–10 January 1985. Institute of Agricultural Research, Addis Ababa, Ethiopia. 16 pp.

Kimenye D. 1981. Production traits of Kenya Sahiwal cattle. Bulletin of Animal Health and Production in Africa 29:121–124.

Kiwuwa G H, Trail J C M, Kurtu M Y, Getachew Worku, Anderson F M and Durkin J. 1983. Crossbred dairy cattle productivity in Arsi region, Ethiopia. ILCA Research Report 11, ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 29 pp.

Klein H D. 1981. Contribution á (estimation de la production sur paturage sahélien au Niger. Revue d'élevage et de médecine vétérinaire des pays tropicatex 34(2): 211–220.

Landais E. 1983. Analyse des systèmes d'élevage bovin sédentaire du nord de la Côte d'Ivoire. 2. Données zootechniques et conclusions générales. Institut d'élevage et de médecine vétérinaire des pays tropicaux, Maisons-Alfort, France/Ministère de la recherche scientifique, Institut des savanes, Bouake, Côte d'Ivoire. pp. 335–759.

Landais E, Poivey J P and Seitz J L. 1980. Recherches sur la reproduction du cheptel taurin sédentaire du nord de la Côte d'Ivoire: utilisation des intervalles entre vêlages; aspects méthodologiques et premiers résultats. Revue d'élevage et de médecine vétérinaire des pays tropicaux 33(2):193–204.

Lhoste P, Cloe L, Hoste C and Deslandes P.1980. Comparaison des aptitudes à la production de viande de 4 types génétiques bovins de Côte d'Ivoire. 1. Résultats de croissance. 2. Résultats d'abattages et étude des carcasses. Ministére de la recherche scientifique, Département Elevage/Centre de recherches zootechniques de Minankro, Bouake, Côte d'Ivoire. 53 pp.

Logan L L, Goodwin J T, Tembely S and Graig J M. 1984. Maintaining Zebu Maure cattle in a tsetse infested area of Mali. 2. Epidemiological considerations. Tropical Animal Health and Production 18(1): 1–12.

Mack S D, Sumberg J E anti Okali C. 1985. Small ruminant production under pressure: The example of goats in southeast Nigeria. In: J E Sumberg and K Cassaday (eds), Sheep and goats in humid West Africa. Proceedings of the Workshop on Small Ruminant Production Systems in the Humid Zone of West Africa, held in Ibadan, Nigeria, 23–26 January 1984. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. pp. 47–52.

Mahir M A. 1978. A note on progeny testing of Kenana stud bulls at Um-Banein Livestock Improvement Station. Sudan Journal of Veterinary Science and Animal Husbandry 19:117–123.

Maloo S, Chema S, Connor R J, Durkin J W, Kimotho P G, Maehl H M, Mukendi F, Murray M, Rarieya J M and Trail J C M. 1987. Efficacy of chemoprophylaxis for East African Zebu cattle exposed to trypanosomiasis in village herds in Kenya. In: International Scientific Council for Trypanosomiasis Research and Control. 19th meeting, Lome, Togo, 1987. Publication 114. OAU/STRC (Organisation of African Unity/Scientific and Technical Research Commission), Nairobi, Kenya. pp. 282–287.

Matthewman R W. 1980. Small ruminant production in the humid tropical zone of southern Nigeria. Tropical Animal Health and Production 12(4): 234–242.

Mchau K W. 1987. Dairy recording on small farms in the Mbeya region of Tanzania. ILCA Newsletter 6(4): 6–7. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia.

McKinnon D and Rocha A. 1985. Reproduction, mortality and growth of indigenous sheep and goats in Mozambique. In: R T Wilson and D Bourzat (eds), Small ruminants in African agriculture. Proceedings of a conference held at ILCA, Addis Ababa, Ethiopia, 30 September–4 October 1985. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. pp. 154–162.

Mombeshora B, Agyemang K and Wilson R T. 1985. Livestock ownership and management in the Chibi and Mangwende communal areas of Zimbabwe. ILCA Small Ruminant and Camel Group Document SRC 2. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 25 pp.

Mosi R D. 1980. Some factors affecting reliability of within ranch performance testing of beef bulls in Kenya. MSc thesis, University of Edinburgh, Edinburgh, UK. 52 pp.

Mrode R A and Akinokun J O. 1986. Genetic parameters and factors affecting reproductive performance in White Fulani cattle in southern Nigeria. Tropical Animal Health and Production 18(2): 81–85.

Mtenga L A, Morungu L A, Nyaki F P and Mgheni M. 1981. Effect of breed and nutrition on performance of sheep in Tanzania. In: B M Kessy (ed), Proceedings of the Eighth Scientific Conference of the Tanzania Society of Animal Production, 26–29 May 1981, held at Arusha, Tanzania. (Vol. 8). Tanzania Society of Animal Production, Morogoro, Tanzania. pp. 123–143

Murayi T, Sayers A R and Wilson R T. 1987. La production des petits ruminants Bans les stations de recherche de l'Institut des sciences agronomiques du Rwanda. ILCA Research Report 15. ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 58 pp.

Mwandotts B J. 1978. Factors affecting weaning weight of the Small East African Shorthorn Zebu, Baran, Sahiwal, Boran × E.A.S.Z, Sahiwal × E.A.S.Z., Friesian × Boran and Friesian × Sahiwal cattle at Kiboko and Bachuna (Kenya). MSc thesis, University of Nairobi, Nairobi, Kenya. 72 pp.

Ngere L O and Aboagye G. 1981. Reproductive performance of the West African Dwarf and the Nungua Blackhead sheep of Ghana. Animal Production 33(3): 249–253.

Nigeria, Federal Ministry of Education, Science and Technology. 1984. Highlights of research achievements on animal production. Report by the National Animal Production Research Institute on Science and Technology Briefing, Lagos, December 1984. Ahmadu Bello University, Shika, Zaria, Nigeria. 53 pp.

Njwe R. 1978. The effect of protein supplementation on the utilization of cured and fresh Giant Star grass (Cynodon nlemfuensis var. robustus) by West African Dwarf sheep. Report. University of Ibadan, Ibadan, Nigeria. 304 pp.

Nkhonjera L P, Agyemang K and Butterworth M H. 1987. The performance of cattle stallfed for beef in Malawi. Tropical Agriculture (Trinidad) 64(2): 105–110.

Nuru S and Dennis S M. 1976. Abortion and reproductive performance of cattle in Northern Nigeria: A questionnaire survey. Tropical Animal Health and Production 8(4): 23–29.

Nwodi S N. 1979. Management of young kids less than 7 months. BSc thesis, Department of Animal Science University of Ibadan, Ibadan, Nigeria. 81 pp.

O'Donovan P B. 1979. Fattening crossbred and zebu cattle on local feeds and by-products in Ethiopia. World Animal Review 30:23–29.

Ogunnubi M M. 1979. Growth rate of calves of different breeds and crosses at the Iwo Road dairy farm. BSc thesis, Department of Animal Science, University of Ibadan, Ibadan, Nigeria. 64 pp.

Olayiwole M Band Fulani I J. 1978. Economics of commercial beef production under feedlot system of management. National Animal Production Research Institute, Ahmadu Bello University, Zaria, Nigeria. 14 pp.

Olayiwole M B, Buvanendran V, Fulani I J and Ikhatua J U. 1981. Intensive fattening of indigenous breeds of cattle in Nigeria. World Review of Animal Production 27: 71–77.

Opasina B A and Adeoye S A O. 1984. Matching health and performance in village goats and sheep in two contrasting locations in southwest Nigeria. 40 pp. [ILCA library accession number 35098]

Orji B I and Steinbach J. 1981. Post-weaning growth and development of Nigerian Dwarf sheep. Tropical Animal Health and Production 13(2): 101–106.

Otchere E O. 1987. The productivity of White Fulani (Bunaji) cattle in pastoral herds on the Kaduna plains, Nigeria. Internal Communication No. 46. Subhumid Programme, ILCA (International Livestock Centre for Africa), Kaduna, Nigeria. 27 pp.

Oyedipe E O, Buvanendran V and Eduvie L O. 1982. Some factors affecting the reproductive performance of White Fulani (Bunaji) cattle. Tropical Agriculture (Trinidad) 59(3): 231–234.

Peacock C P. 1984. Sheep and goat-production in Maasai group ranches. PhD thesis, University of Reading, Reading, UK. xvi + 416 pp.

Perry B D, Mwanaumo B, Schels M F, Eicher E and Zaman M R. 1984. A study of health and productivity of traditionally managed cattle in Zambia. Preventive Veterinary Medicine 2:633–653.

Poivey J P, Seitz J Land Landais E. 1981. Finalités et aspects méthodologiques d'un systéme informatisé de suivi individuel des animaux dans les élevages bovins villageois du Nord de la Côte-d'Ivoire. Revue d'elevage et de médecine vétérinaire des pays tropicaux 34(2): 199–210.

Poivey J P, Landais E and Berger Y. 1982. Etude et amelioration genetique de la croissance des agneaux Djallonke. Resultats obtenus au Centre de recherches zootechniques de Bouake (Côte-d'Ivoire). Revue d'élevage et de médecine vétérinaire des pays tropicaux 34(4): 421–433.

Pollot G E and Ahmed F A. 1979. The performance of some Hereford × Kenana and Charolais × Kenana calves compared to their purebred Kenana contemporaries. Um-Banein Livestock Research Bulletin 5. Animal Production Research Administration, Ministry of Agriculture, Food and Natural Resources, Singa, Sudan. 8 pp.

Pollot G E and Ahmed F A. 1979. The effect of feeding diets containing 15, 30, 45 and 60% molasses on the performance of Watish Lambs. Um-Banein Livestock Research Bulletin 8. Animal Production Research Administration, Ministry of Agriculture, Food and Natural Resources, Singa, Sudan. 12 pp.

Pullan N B. 1979. Productivity of White Fulani cattle on the Jos Plateau, Nigeria. 1. Herd structures and reproductive performance. Tropical Animal Health and Production 11(4): 231–238.

Pullan N B. 1980. Productivity of White Fulani cattle on the Jos Plateau, Nigeria. 2. Nutritional factors. 3. Disease and management factors. Tropical Animal Health and Production 12(1): 17–24; 12(2): 77–84.

Ravelontahina J A. 1986. Performance de reproduction et production de fait en prémière lactation chez les vaches Frison–Zebu à la Station de recherches de Kianjasoa. In: Actes du Colloque sur l'amélioration de l'elevage en zone tropicale: cas de Madagascar, tenu a Antananarivo, 3–13 septembre 1985. Academie malgache, Antananarivo, Madagascar. pp. 301–312.

Richard D, Humbest F and Douma A. 1985. Essais d'alimentation de moutons de Niger. Institut d'elevage et de médecine vétérinaire des pays tropicaux, Maisons-Alfort, France/Institut national de recherches agronomiques nigeriennes, Niamey, Niger. 142 pp.

Rombaut D. 1980. Comportement du mouton Djallonké en élevage rationnel. Revué d'élevage et de médecine vétérinaire des pays tropicaux 33(4): 427–439.

Saeed A M, Ward P N, Light D, Durkin J W and Wilson R T. 1987. Characterisation of Kenana cattle at Um Banein, Sudan. ILCA Research Report 16, ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 46 pp.

Schaar J, Brännäng E and Meskel L B. 1981. Breeding activities of the Ethio-Swedish integrated rural development project. 2. Milk production of zebu and crossbred cattle. World Animal Review 37:31–36.

Somada B. 1982. The effect of environment on reproductive performance of dairy cattle in south western Nigeria. Ife Journal of Agriculture (Nigeria) 4:111–117.

Suliman A H, El Amin F M and Osman A H. 1978. Reproductive performance of Sudan indigenous sheep under irrigated Gezira conditions. World Review of Animal Production 14(1): 71–79.

Swenson C, Schaar J, Brannang E and Meskel L B. 1981. Breeding activities of the Ethio-Swedish integrated rural development project. 3. Reproductive performance of zebu and crossbred cattle. World Animal Review 38:31–36.

Synge B A. 1981. Milk production under extensive systems. In: J E Huhn (ed), Proceedings of the conference on impact of animal disease research and control on livestock production in Africa. Third International Conference of the Association of the Institutes of Tropical Veterinary Medicine, Nairobi, Kenya, 1–5 September 1980. German Foundation for International Development, Berlin, FRG. pp. 18–24.

Tawonezvi H P R. 1987. Genetic improvement in growth of Nkone cattle. In: J Grant (ed), The indigenous cattle breeds of Zimbabwe. Proceedings of a workshop held at Matopos Research Station, 26–7 February 1987. Matopos Research Station, Bulawayo, Zimbabwe. pp. 61–67.

Thorpe W and Cruikshank D K R. 1979. Productivities of cattle breeds in Zambia. Results of research at the Central Research Station, Mazabuka, 1965 to 1977, and at Mochipapa Regional Research Station, Choma, 1972 to 1978. A report to the Department of Agriculture, Ministry of Agriculture and Water Development, Government of Zambia. Overseas Development Administration, London, UK. 165 pp.

Trail J C M and Gregory K E. 1981. Characterization of the Boran and Sahiwal breeds of cattle for economic characters. Journal of Animal Science 52:1286–1293.

Trail J C M and Gregory K E. 1981. Sahiwal cattle: An evaluation of their potential contribution to milk and beef production in Africa. ILCA Monograph 3, ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 128 pp.

Trail J C M, Sones K, Jibbo J M C, Durkin J, Light D E and Murray M. 1985. Productivity of Boran cattle maintained by chemoprophylaxis under trypanosomiasis risk. ILCA Research Report 9, ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 76 pp.

van Vlaenderen G. 1985. Northern Togo: Sheep husbandry development programme. World Animal Review 53:19–26.

Ward H K. 1978. Performance testing the Mashona at Makoholi. The Farmer (Rhodesia) 6(2): 47–49.

Wardle C. 1979. The design and management of pastoral development - promoting cattle fattening among peasants in Niger. ODI Pastoral Network Paper No. 8c. Overseas Development Institute, London, UK. 35 pp.

Wilson R T. 1986. Livestock production in central Mali: Long-term studies on cattle and small ruminants in the agropastoral system. ILCA Research Report 14, ILCA (International Livestock Centre for Africa), Addis Ababa, Ethiopia. 111 pp.

Wilson R T and Peacock C P. 1983. Structure de la population et quelques paramètres zootechniques chez les caprins et les ovins des trois villages du nord de la Haute Volta. ILCA/Mali Programme Document AZ 93. Bamako, Mali. 42 pp.

Wylie B. 1983. Effects of deferred and continuous grazing regimes, daily and two day watering regimes, and perennial pasture access on heifer weight gains. Ministry of Rural Development, Range and Livestock Project, United States Agency for International Development, Niamey, Niger. 42 pp.

Zimbrwa G. 1987. The beef performance testing scheme. In: J Grant (ed), The indigenous cattle breeds of Zimbabwe. Proceedings of a workshop held at Matopos Research Station, 26–27 February 1987. Matopos Research Station, Bulawayo, Zimbabwe. pp. 47–52.

Previous PageTop Of PageNext Page