TAILIEUCHUNG - Báo cáo sinh học: " A simulation study of the effect of connectedness on genetic trend"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: A simulation study of the effect of connectedness on genetic trend | 67 Genet Sei Evol 1996 28 67-82 Elsevier INRA Original article A simulation study of the effect of connectedness on genetic trend E Hanocq D Boichard JL Foulley Station de génétique quantitative et appliquée Institut national de la recherche agronomique 78352 Jouy-en-Josas cedex France Received 20 February 1995 accepted 9 October 1995 Summary - A breeding scheme was simulated with four subpopulations over seven separate generations. Males were progeny tested before selection. A varying proportion of link sires were used across populations to estimate the genetic level of each subpopulation. The male replacement policy allowed some gene flow across subpopulations. Without any connection between subpopulations the genetic differences between subpopulations were not estimable and the overall genetic trend was limited. With few connections proportion of link sires 1 16 the accuracy of the contrast between subpopulations was poor but the gene flow between subpopulations made it possible to increase the overall genetic trend particularly for the first generations. A high level of connections improved the accuracy of the genetic evaluation but only slightly increased the genetic trend. connectedness genetic trend progeny testing design efficiency selection strategy Resume Etude par simulation de 1 effet du degré de connexion sur le progrès génétique. Un schema de selection constitué de quatre sous-populations est simulé durant sept generations séparées. Les males sont sélectionnés à I issue de leur testage sur descendance. Des males de connexion sont utilises en proportion variable afin d estimer le niveau génétique de chaque sous-population OU groupe de taureaux. La politique de renouvellement adoptée permet I existence de flux de genes entre les sous-populations. En Vabsence de connexion les differences génétiques entre groupes de taureaux ne sont pas estimables et le progrès génétique global est limité. En presence de connexions en faible quantité proportion de .

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