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 some growth and egg production traits in laying Brown Tsaiya | 377 Genet. Sei. Evol. 1989 21 377-384 Elsevier INRA Original article Genetic parameters of some growth and egg production traits in laying Brown Tsaiya Anas platyrynchos c. Tai1 R. Rouvier2 and . Poivey2 1Taiwan Livestock Research Institute Department of Animal Breeding Tainan 71210 Taiwan Republic of China 2Institut National de la Recherche Agronomique station d amelioration génétique des animaux centre de recherches de Toulouse BP 27 F 31326 Castanet-Tolosan France received 4 November 1987 accepted 22 December 1988 Summary - Five hundred and thirty seven female ducks from the native Brown Tsaiya in Taiwan derived from 156 dams 40 sires 4 locations sire origin from five hatches were used in study. Fifteen traits were recorded. Average values of traits measured were the following adult 30 weeks of age body_weight 1397- 120 g age at first egg 121 11 days egg numbers up to 2457 280 and 360 days of age 107 13 139 15 207 26 respectively egg shell strength kg cm2 egg shell thickness mm egg weight at 30 and 40 weeks of age g and g. Genetic parameters were calculated heritability estimate from the sire variance component fl2 dam variance component h2d . Body weights at 8 16 20 30 40 weeks of age showed high additive genetic variation i2 to . For egg weight at 30 and 40 weeks of age i2 and i2 . For traits related to egg number i2 values were low and increased with age being and respectively for 245 280 and 360 days of age. But the respective heritabilities calculated from dam variance components were higher being and . The non-additive genetic variation of these traits and perhaps the existence of maternal genetic variance indicate the possibility of conducting within line selection and cross-breeding between lines of the same breed. laying duck - Brown Tsaiya - economical trait - genetic parameter Resume Paramètres génétiques de quelques caractères de croissance et de production d oeufs
