TAILIEUCHUNG - Báo cáo khoa hoc:"Non-random mating for selection with restricted rates of inbreeding and overlapping generations"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Non-random mating for selection with restricted rates of inbreeding and overlapping generations | 23 Genet Sei. Evol. 34 2002 23-39 INRA EDP Sciences 2002 DOI gse 2001002 Original article Non-random mating for selection with restricted rates of inbreeding and overlapping generations Anna K. Sonesson Theo . Meuwissen Institute for Animal Science and Health ID-LelYStad . Box 65 8200 AB LelYStad The Netherlands Received 24 November 2000 accepted 8 August 2001 Abstract - Minimum coancestry mating with a maximum of one offspring per mating pair MCI is compared with random mating schemes for populations with overlapping generations. Optimum contribution selection is used whereby DF is restricted. For schemes with DF restricted to per year 256 animals born per year and heritability of genetic gain increased with 18 compared with random mating. The effect of MCI on genetic gain decreased for larger schemes and schemes with a less stringent restriction on inbreeding. Breeding schemes hardly changed when omitting the iteration on the generation interval to find an optimum distribution of parents over age-classes which saves computer time but inbreeding and genetic merit fluctuated more before the schemes had reached a steady-state. When bulls were progeny tested these progeny tested bulls were selected instead of the young bulls which led to increased generation intervals increased selection intensity of bulls and increased genetic gain 35 compared to a scheme without progeny testing for random mating . The effect of MC1 decreased for schemes with progeny testing. MC1 mating increased genetic gain from 11-18 for overlapping and 1-4 for discrete generations when comparing schemes with similar genetic gain and size. mating overlapping generations selection rate of inbreeding genetic response optimum contribution 1. introduction For breeding schemes the selection step determines the increase in average coancestry of the population but the mating step can improve the genetic structure of the population for the next round of selection. Caballero et al

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