TAILIEUCHUNG - Báo cáo sinh học: " Factors of diversity of domestic behaviour in sheep"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Factors of diversity of domestic behaviour in sheep | Genet Sei Evol 1997 29 73-92 Elsevier INRA 73 Original article Factors of diversity of domestic behaviour in sheep V Lankin Siberian Department of the Russian Academy of Sciences Institute of Cytology and Genetics 10 Lavrentiev Avenue Novosibirsk 630090 Russia Received 16 January 1996 accepted 19 November 1996 Summary - An ethological test situation with stimuli that induce fear-motivated withdrawal reactions such as isolation from the herd presence of man and change of feeding and locomotion routine was used to measure domestic behaviour. The reactions of withdrawal from man in sheep of various breeds were reduced by increasing food motivation and vice versa. Withdrawal reactions decreased with ageing and the rate of decrease was higher with increasing food motivation. Interbreed comparisons involving 11 breeds have detected a breed specificity of behavioural variation in sheep. Lowly-specialized breeds are characterized by a large number of animals of the wild class with a high prevalence of man-withdrawal reaction and a low incidence of feeding reactions in the behavioural test. In highly-specialized commercial breeds the range of behavioural diversity is wider and the number of animals in domesticated classes is larger reaching eg in the East-Friesian breed. It is hypothesized that the polymorphism of domestication-related behaviour in commercial breeds has developed under the influence of natural selection for adaption under stressful conditions of breeding under the control of man and selection for productivity. sheep behaviour breed domestication Resume Facteurs de variation du comportement domestique chez le mouton. Le comportement des animaux domestiqués se caractérise par une absence de reaction de retrait vis-à-vis de I homme. Ce comportement est mesuré dans un test faisant appel à un conflit de motivation entre la reaction de peur induite par I isolement du troupeau et la presence de I homme et la reaction d approche vers une auge .

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