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 body weight, egg production and shell quality traits in the Brown Tsaiya laying duck | Genet Sei Evol 1995 27 459-472 Elsevier INRA 459 Original article Genetic parameters of body weight egg production and shell quality traits in the Brown Tsaiya laying duck YS Cheng1 2 R Rouvier1 JP Poivey1 c Tai2 Institut national de la recherche agronomique station d amelioration génétique des animaux centre de recherches de Toulouse BP 27 F 31326 Castanet-Tolosan cedex France 2 Taiwan Livestock Research Institute Hsin-Hua Tainan 71210 Taiwan Republic of China Received 13 June 1994 accepted 1st June 1995 Summary - Heritabilities and genetic correlations were estimated for 5 575 laying Brown Tsaiya ducks on performance data from 5 generations of a selection experiment by means of a multivariate multimodel restricted maximum likelihood method MM-REML applied to an animal model on the 12 traits feather length at 20 weeks of age FL20 body weight at 20 and 40 weeks of age BW20 BW40 age at first egg AGE1EGG number of eggs laid up to 40 and 52 weeks of age NEGG40 NEGG52 eggshell strength at 30 and 40 weeks of age ES30 ES40 egg weight at 30 and 40 weeks of age EW30 EW40 egg yolk weight at 40 weeks of age EYW40 and the proportion of egg weight to body weight at 40 weeks of age EW40 BW40 . Adult females were heavier than adult males BW40 1 391 g vs 1 310 g ES40 was lower than ES30 kg cm2 vs kg cm2. Heritabilities were found to be low and for ES40 ES30 NEGG52 NEGG40 FL20 EYW40 and AGE1EGG respectively to medium and for EW40 BW40 EW40 EW30 BW20 and BW40 respectively . Fifty genetic correlations were tabulated. The pattern of the genetic correlations for the traits to be selected showed that NEGG52 was highly positively correlated with NEGG40 rg uncorrelated with the body weight and was negatively correlated with AGE1EGG rg EW40 rg EW30 rg EYW40 rp ES30 rp ES40 rg FL20 rp and EW40 BW40 rg . Egg weights body weights and eggshell strength .
