TAILIEUCHUNG - Báo cáo sinh học: "Nouveaux résultats d’estimation de l’héritabilité des gains en course des pur-sang en France"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Nouveaux résultats d’estimation de l’héritabilité des gains en course des pur-sang en France | Genet Sei Evol 1996 28 275-283 Elsevier INRA 275 Article original Nouveaux résultats d estimation de 1 héritabilité des gains en course des pur-sang en France B Langlois c Blouin A Tavernier Station de génétique quantitative et appliquée Institut national de la recherche agronomique 78352 Jouy-en-Josas cedex France Regu le 14 novembre 1994 accepté le 26 fevrier 1996 Summary New results on the estimation of the heritabilities of earnings of thoroughbreds in France. Logarithms of yearly earnings of 232 893 horses in flat races and 85145 horses in steeplechases and hurdle races in France from Í950 to 1990 were analysed according to an animal model. REML methodology was applied to chronological subsamples of this enormous file to estimate genetic parameters. In flat races from the birth year 1960 to 1987 heritability increased from to according to a statistically highly significant linear trend and the repeatability between 2 and 3 years changed in a similary significant manner from to . Over the jumps from 1962 to 1985 fluctuations appeared probably due to a lower precision of the estimates and no significant evolution could be seen for heritability near . Repeatability between 4 and 5 years however increased significantly. The reasons for the evolution of these parameters over time are discussed. Two main hypotheses are mentioned i introduction of external genetic variability in French pedigrees through American blood this hypothesis however is not in agreement with the very small genetic distance between the two populations and ii an equilibrium between two opposite sources generating linkage disequilibrium selection and assortative mating. The intensity of these two forces observed in each subsample allows US to explain fairly well the variations of observed parameters. thoroughbred racing ability genetic parameter assortative mating Resume - Le logarithme du gain annuel de 232 893 chevaux en plat et de 85 145 chevaux sur les obstacles ayant

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