TAILIEUCHUNG - Báo cáo khoa hoc:" Estimation of correlations between ewe litter size and maternal effects on lamb weights in Merino sheep"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Estimation of correlations between ewe litter size and maternal effects on lamb weights in Merino sheep | 493 Genet. Sei. Evol. 30 1998 493-501 Inra Elsevier Paris Original article Estimation of correlations between ewe litter size and maternal effects on lamb weights in Merino sheep Mohamed Anallaa Juan Manuel Serradillab a Department of Biology The Abdelmalek Essaadi University . Box 2121 93002 Tetouan Morocco b Department of Animal Science University of Cordoba ETSIAM . Box 3048 14080 Cordoba Spain Received 16 September 1997 accepted 2 July 1998 Abstract - Data corresponding to weights from birth to 90 days of age of 4 425 lambs and to 3 355 litters at lambing of 964 ewes taken from 1987 to 1995 were used. The main objective of the study was to quantify the possible relationship between litter size of the ewes and their maternal effects on offspring weights. The results showed that the additive genetic correlation between litter size and the maternal component of weight is zero. The additive genetic correlation was low between litter size and the direct component of weight and was similar to the correlation between permanent environmental effects for litter size and maternal permanent environmental effects for weights. In view of the results obtained no complication should be expected if the local Merino breed could be oriented to the production of high quality females improving their litter size and maternal abilities to be used in terminal crosses for lamb meat production. Inra Elsevier Paris sheep weight litter size maternal effects correlations Resume Estimation des correlations entre la prolificite des brebis et les effets maternels sur les poids des agneaux dans la race Merinos. Les données utilisées correspondent aux poids mensuels depuis la naissance jusqu a 90 jours d age de 4 425 agneaux et 3 355 mises-bas de 964 brebis collectées de 1987 à 1995. Le principal objectif de ce travail a été de quantifier la relation possible entre la prolificite des brebis et leurs influences maternelles sur les poids de la descendance. Les résultats obtenus montrent .

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