TAILIEUCHUNG - Báo cáo sinh học: "A comparison of four systems of group mating for avoiding inbreeding"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: A comparison of four systems of group mating for avoiding inbreeding | 141 Genet Sei Evol 1996 28 141-159 Elsevier INRA Original article A comparison of four systems of group mating for avoiding inbreeding T Nomura K Yonezawa Faculty of Engineering Kyoto Sangyo University Kyoto 603 Japan Received 22 February 1995 accepted 15 November 1995 Summary - Circular group mating has been considered one of the most efficient systems for avoiding inbreeding. In this system a population is conserved in a number of separate groups and males are transferred between neighbouring groups in a circular way. As alternatives some other mating systems such as Falconer s system HAN-rotational system and Cockerham s system have been proposed. These systems as a whole are called cyclical systems since the male transfer between groups changes in a cyclical pattern. In the present study circular group mating and the three cyclical systems were compared with respect to the progress of inbreeding in early and advanced generations after initiation. It was derived that the cyclical systems gave lower inbreeding coefficients than circular group mating in early and not much advanced generations. Circular group mating gave slightly lower inbreeding after generations more advanced than 100 when the inbreeding coefficient became as high as or higher than 60 . Considering that it is primarily inbreeding in early generations that determines the persistence of a population it is concluded that cyclical systems have a wider application than circular group mating. Inbreeding in the cyclical systems increased in oscillating patterns with different amplitudes but with essentially the same trend. Among the three cyclical systems Cockerham s system for an even number of groups and the HAN-rotational system for an odd number are advisable since they exhibited the smallest amplitudes of oscillation. inbreeding avoidance inbreeding coefficient group mating conservation of animal population effective population size Resume - Une comparaison de quatre systèmes d accouplements par .

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