Comparison of three terminal sire breeds for meat crossbred lambs in Morocco | Comparaison de trois races de croisement terminal pour la production des agneaux croises de boucherie au Maroc
2000
El-Fadili, M. | Leroy, L.P. (Universite de Liege, Sart Tilman (Belgium). Faculte de medecine veterinaire. Dept. de genetique)
Crossbreeding between 602 Timahdit (T) and F1 (D'man x Timahdit) as dam lines and Ile-de-France (IF), Lacaune (L), and Merinos precoce (MP) as sires lines were evaluated for ewe reproductive performances and production performances on 860 lambs and 150 slaughtered lambs. Ewes mated to IF showed the lower fertility rate (-7/) than those mated to L and MP. However, for litter size and weights the difference were not significant. Genetic group of ewes had highly significant effects on these traits. At 90 days of age after lambing, the F1 ewes weaned +0.47 more lambs and produced 6.69 kg more than T ewes. However, finished lamb growth rates of L and MP were lower than those of IF. The later lambs realized also the best conversion index of feed, weight carcass gains, dressing percentage, and larger Longissimus muscle area than lambs sired by L and MP. Lambs sired by L had trend to deposit more mesenteric fat and longer carcasses. Dam genetic group did not show differences for the majority of carcass traits. It was concluded that IF rams as terminal sire seems more suitable for lambs production under intensive production system, where L should be more suitable under less intensive lambs production systems. Furthermore, with regard to the overall productivity the F1 dams will be a genetic group of choice to improve meat production in Morocco.
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