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Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Genetic variability within French race and riding horse breeds from genealogical data and blood marker polymorphisms | Genet Sei Evol 1996 28 83-102 Elsevier INRA 83 Original article Genetic variability within French race and riding horse breeds from genealogical data and blood marker polymorphisms s Moureaux1 2 E Verrier1 2 A Ricard1 JC Mériaux3 1 station de génétique quantitative et appliquée Institut national de la recherche agronomique 78352 Jouy-en-Josas cedex 2 Departement des sciences animates Institut national agronomique Paris-Grignon 16 rue Claude-Bernard 75231 Paris cedex 05 3 Laboratoire d analyses génétiques pour les espèces animales 78352 Jouy-en-Josas cedex France Received 20 April 1995 accepted 21 September 1995 Summary - The genetic variability of five horse breeds raised in France was analysed Thoroughbred Trotteur Frangais Arab Anglo-Arab and Selle Frangais. Genealogical data and genotypes at seven blood group and nine protein loci were used. Paternal family sizes were found to be unbalanced especially in Trotteur frangais Selle Frangais and Thoroughbred. Average coefficients of inbreeding for offspring born from 1989 to 1992 were 102 Thoroughbred 1.86 Trotteur Frangais 3.08 Arab 1.17 Anglo-Arab and 0.70 Selle Frangais . High individual coefficients 6.25 were found in substantial proportions only in Arab where such high values represent one fifth of the total individual coefficients. Inbreeding was analysed according to the number of generations of ancestors considered. The results revealed the importance of close inbreeding in Arab and remote inbreeding in Thoroughbred. Arab was the only breed that showed evidence for a substantial amount of mating between close relatives. From 1974 to 1992 the rates of inbreeding in percentage points per year were 0.026 Thoroughbred 0.052 Trotteur Frangais 0.071 Arab 0.029 Anglo-Arab and 0.024 Selle Frangais . The distribution of genetic contributions of founder animals was found to be unbalanced especially in Trotteur Frangais where 25 founder animals only accounted for half the actual gene pool. No significant time-trend was
