TAILIEUCHUNG - Báo cáo sinh học: " Genetic parameters of the twisted legs syndrome in broiler chickens"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Genetic parameters of the twisted legs syndrome in broiler chickens | Genet Sei Evol 1996 28 177-195 Elsevier INRA 177 Original article Genetic parameters of the twisted legs syndrome in broiler chickens E Le Bihan-Duval1 c Beaumont1 J J Colleau2 1 Station de recherches avicoles Institut national de la recherche agronomique 37380 Nouzilly 2 Station de génétique quantitative et appliquée Institut national de la recherche agronomique 78352 Jouy-en-Josas cedex France Received 14 November 1994 accepted 15 December 1995 Summary - Genetic parameters of two types of angulations described in the twisted legs syndrome as valgus and bilateral or unilateral varus were investigated in two commercial broiler strains. In the first line 14 264 chickens of both sexes born from 111 sires 76 maternal grandsires and 768 dams were studied. In the second line corresponding figures were 8 164 chickens of both sexes born from 94 sires 71 maternal grandsires and 553 dams. Chickens were classified at 6 weeks according to the type of pathology. Since deformities under study were unordered categorical traits a generalized linear model using a multinomial logistic transformation as link function was applied. Location parameters were estimated by maximum a posteriori and variance components by maximum marginal likelihood using a tilde-hat approximation. The model of analysis took into account the fixed effects of the hatch and the sex as well as the random effects of the sire maternal grandsire and dam within maternal grandsire. Pseudoheritability of latent susceptibility to valgus was equal to and in lines A and B respectively when estimated from the sire maternal-grandsire component and to and respectively when estimated from the dam component for varus estimates of the pseudoheritability were equal to and in lines A and B when estimated from the sire maternal-grandsire component and to and when estimated from the dam component. Higher values of the dam heritabilities could suggest the existence of maternal or dominance

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