ILCA Research Report No. 3
A. Fall, Centre de Recherches Zootechniques de Kolda
M. Diop, Laboratoire National d'Elevage et de Recherches Vétérinaires Dakar-Hann
Jennifer Sandford, Y.J. Wissocq, J. Durkin and J.C.M. Trail International Livestock Centre for Africa
Data recorded under the supervision of E. Gueye
International Livestock Centre for Africa
Addis Ababa, Ethiopia
September 1982
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ILCA PUBLICATIONS The International Livestock Centre for Africa (ILCA) is an autonomous, non-profit making research and information centre with a mandate to improve livestock production throughout sub-Saharan Africa. The activities and publications of the centre are financed by the Consultative Group on International Agricultural research (CGIAR). The CGIAR members which have founded ILCA to date are the International Development Research Centre, the International Fund for Agricultural Development, the United Nations Development Programme, the World Bank, and the governments for Australia, Belgium, Canada, China, Denmark, the Federal Republic of Germany, Finland, France, Iran, Ireland, Italy, the Netherlands, Nigeria, Norway, Saudi Arabia, Sweden, Switzerland, the United Kingdom and the United States of America. Responsibility for ILCA publications rests solely with the centre and with such other parties as may be cited as joint authors. Until 1982, the centre's two main series of scientific publications were Systems Studies and Monographs. These two series have now been superceded by the present series of Research Reports. |
ABSTRACT
Reproductive performance, viability and growth performance traits of Djallonke sheep and N'Dama cattle at the Centre de Recherches Zootechniques, Kolda, Senegal were analysed. These traits were then used to build up overall productivity indices for the two species.
KEY WORDS
Reproductive performance, viability, growth, Djallonke sheep, N'Dama cattle, Senegal, productivity index.
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The centre de recherches zootechniques, Kolda
Introduction
The centre at Kolda
Cattle and sheep
Herd management
Supplementary feeding
Animal health programme
Data recording procedures
Data preparation
Data analyses
Sheep reproductive performance
Introduction
Age at first lambing
Conception rate by month
Lambing interval
Litter size
Annual reproduction rate
Length of ewe productive life
Lamb mortality
Mortality rates in relation to genetic improvement
Breeding ewe mortality
Causes of death
Environmental and genetic effects on lamb weights at seven different ages
Ewe body weights
Environmental and genetic effects on lambs from birth to 12 months of age
Correlations between weight and linear measurements
Repeatability of early lamb measurements
Indices of ewe productivity
Flock productivity
Cattle reproductive performance
Introduction
Age at first calving
Conception rate by month
Calving interval
Length of cow productive life
Calf mortality
Mortality rates in relation to genetic improvement
Cow mortality
Causes of death
Environmental and genetic effects on calf weights
Cow body weights
Environmental and genetic effects on calf linear measurements
Correlations between weight and linear measurements
Indices of cow productivity
Herd productivity
The consultative group on international agricultural research