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Accueil du site → Doctorat → États-Unis → 1998 → Biological and economic efficiency of genetic types of dual-purpose cattle simulated in different management systems in Mali, West Africa

Washington State University (1998)

Biological and economic efficiency of genetic types of dual-purpose cattle simulated in different management systems in Mali, West Africa

Coulibaly, Mamadou Dougakoro

Titre : Biological and economic efficiency of genetic types of dual-purpose cattle simulated in different management systems in Mali, West Africa

Auteur : Coulibaly, Mamadou Dougakoro

Université de soutenance : Washington State University

Grade : Doctor of Philosophy (PhD) 1998

Résumé
Efficiency for milk and beef offtake of four cattle genetic groups of Mali, West Africa was predicted in different management scenarios using an adapted version of Colorado Beef Cattle Production Model. Genetic groups were, the N’Dama, Zebu, .50Montéliard :.50Zebu, and .50Holstein :.25Montbéliard :.25Zebu. Management scenarios were different combinations of feeding and milk offtake levels. A first study investigated the effects of genetic group on biological and economic efficiencies for milk and beef offtake. Cattle were fed at a “Good nutrition” level and milked at 25% of milk production. “Good nutrition” was defined to meet all nutritional requirements. For Zebu, biological efficiency was 11 kg total digestible nutrient (TDN) per kg total salable liveweight or 4 kg TDN per kg milk equivalent product, and economic efficiency was 112,215 and 136,800 CFA francs over feed costs in the cow-calf and cow-calf-feedlot programs, respectively. N’Dama was less efficient and economical than Zebu, and both were less efficient than .50Montéliard :.50Zebu. and .50Holstein :.25Montbéliard :.25Zebu. A second study examined the effects of genetic group by management interaction on efficiency using the same four genetic groups. Genetic groups were simulated in all combinations of three levels of feeding. “Poor nutrition”, “Low nutrition”, and “Good nutrition” and three levels of milk offtake, 0, 25, and 50% of milk production. “Poor nutrition” and “Low nutrition” were defined as 85% and 90% of “Good nutrition”. Biological efficiency and return over feed costs were both influenced by interaction effects between genetic group by management scenario, but were strongly determined by differences among genetic groups. The .50Holstein :. 25 Montbéliard :.2 5 Zebu in “Good nutrition” and 50% milk offtake management was the most efficient and economical production scenario. The N’Dama in “Poor nutrition” and 0% milking was the least efficient. In “Poor nutrition” or “Low nutrition”, Zebu at 50% milk offtake generated greater returns over feed costs than both .50Montéliard :.50Zebu and .50Holstein :.25Montbéliard :.25Zebu at 0% milk offtake. Overall, the efficiency of cattle production in Mali can be improved by use of crossbred cattle with higher potential for milk and beef. Under limited feed resources however, milking the Zebu at 50% of its milk production potential may be more economical.

Mots clés : Dairy, Cattle, Mali, Beef, Genetic types, Biological sciences, Livestock

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