TAILIEUCHUNG - Báo cáo sinh học: "Inbreeding depression on beef cattle traits: Estimates, linearity of effects and heterogeneity among sire-families"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học quốc tế đề tài: Inbreeding depression on beef cattle traits: Estimates, linearity of effects and heterogeneity among sire-families | Genet. Sel. Evol. 40 2008 511-527 INRA EDP Sciences 2008 DOI gse 2008018 Available online at Original article Inbreeding depression on beef cattle traits Estimates linearity of effects and heterogeneity among sire-families Nuno Carolino1 Luis T. Gama1 2 1Estacao Zootecnica Nacional - INRB 2005-048 Vale de Santarem Portugal 2Faculdade de Medicina Veterinaria - Universidade Tecnica de Lisboa 1300-477 Lisboa Portugal Received 10 December 2007 accepted 25 March 2008 Abstract - Records from up to 19 054 registered cows and 10297 calves in 155 herds of the Alentejana cattle breed were used to study the effects of individual Fi and maternal Fm inbreeding on reproductive growth and carcass traits as well as assessing the importance of non-linear associations between inbreeding and performance and evaluating the differences among sire-families in the effect of Fi and Fm on calf weight at 7 months of age W7M . Overall regression coefficients of performance traits on inbreeding were small indicating a minor but still detrimental effect of both Fi and Fm on most traits. The traits with the highest percentage impact of Fi were total number of calvings through life and calf weight at 3 months of age W3M followed by longevity and number of calves produced up to 7 years while the highest effect of Fm was on W3M. Inbreeding depression on feed efficiency and carcass traits was extremely small and not significant. No evidence was found of a non-linear association between inbreeding and performance for the traits analyzed. Large differences were detected among sire-families in inbreeding depression on W7M for both Fi and Fm encouraging the possibility of incorporating sire effects on inbreeding depression into selection decisions. Alentejana cattle inbreeding depression individual inbreeding maternal inbreeding 1. INTRODUCTION The Alentejana belongs to the Red Convex group of European southern breeds which is thought to be of African origin 21 and is one of

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