tailieunhanh - Báo cáo sinh học: "Prediction of genetic gains in body weight, egg production and shell quality traits in the Brown Tsaiya laying duck"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Prediction of genetic gains in body weight, egg production and shell quality traits in the Brown Tsaiya laying duck | Genet Sei Evol 1996 28 443-455 Elsevier INRA 443 Original article Prediction of genetic gains in body weight egg production and shell quality traits in the Brown Tsaiya laying duck Anas platyrhynchos YS Cheng1 2 JP Poivey1 R Rouvier1 c Tai2 1 Station d amelioration génétique des animaux centre de recherches de Toulouse Institut national de la recherche agronomique BP 27 31326 Castanet-Tolosan cedex France 2 Taiwan Livestock Research Institute 112 Farm Road Hsin-Hua Tainan 71210 Taiwan Republic of China Received 13 June 1995 accepted 16 August 1996 Summary - An evaluation was made of the expected genetic gain and predicted genetic responses for egg weight and body weight at 40 weeks of age EW40 BW40 number of eggs laid up to 52 weeks of age NEGG52 eggshell strength at 30 or 40 weeks of age ES30 or ES40 in Brown Tsaiya laying ducks selected for five generations by independent culling levels first on a linear phenotypic index for the first three traits and then on ES30 or ES40. The genetic parameters estimated in the base population were used to calculate the expected genetic gains in one generation of selection. The genetic responses per generation were evaluated by averaging the multitrait best linear unbiased prediction BLUP animal model predictors and regressing them on generation number. The per generation genetic responses were g EW40 g BW40 eggs NEGG52 kg cm2 ES30 kg cm2 ES40 . These values fit the expected genetic gains for NEGG52 but they are higher than those for BW40 and lower than those for ES30 and ES40. It was shown that compared to the selection method which has been used and with the same selection intensity in female ducks i constrained selection based on a phenotypic selection index or a genetic index could increase the expected genetic gains in NEGG52 by a factor of or respectively while maintaining constant EW40 and BW40. genetic gain selection laying duck restricted selection index Resume - Prédiction .