TAILIEUCHUNG - Báo cáo sinh học: " Estimation of genetic parameters of preweaning performance in the French Limousin cattle breed"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Estimation of genetic parameters of preweaning performance in the French Limousin cattle breed | Genet Sei Evol 1993 25 177-189 Elsevier INRA 177 Original article Estimation of genetic parameters of preweaning performance in the French Limousin cattle breed MJ Shi D Laloẽ F Ménissier G Renand Institut National de la Recherche Agronomique Centre de Recherches de Jouy-en-Josas Station de Génétique Quantitative et Appliquée 78352 Jouy-en-Josas Cedex France Received 11 June 1992 accepted 7 December 1992 Summary Direct and maternal genetic and environmental parameters of preweaning growth and conformation at weaning were estimated in the French Limousin beef cattle field recording program using the tilde-hat approach of Van Raden and Jung 1988 with a sire maternal grandsire MGS and dam within MGS model. The numerator relationship matrix among bulls was included in the estimation. The data available after editing contained 169 391 calves with performance records from 43 683 dams 7 265 sires 5 664 maternal grandsires and 1 605 herds for the years 1972-1989. The traits involved were birth 120-d and 210-d weights average daily gains from birth to 120-d from 120-d to 210-d from birth to 210-d muscular development MD and skeletal development SD scores at weaning. Estimates ranged from to for additive direct heritabilities and from to for maternal heritabilities. Correlations between direct and maternal genetic effects for these traits were negative ranging from to . Maternal permanent environmental effects were small for all traits accounting for 5-9 of the phenotypic variances for preweaning growth performance and 3 and 4 for MD and SD respectively. beef cattle variance components preweaning growth conformation score direct and maternal effects field data Résumé - Paramètres génétiques des performances avant sevrage en race bovine Limousine frangaise. Les paramètres génétiques et environnementaux de la croissance avant sewage et de la conformation au sewage ont été estimés pour la race Limousine à partir des données du contrôle de .

• Báo cáo khoa học
• Báo cáo sinh học hay
• cách trình bày báo cáo
• báo cáo sinh học
• công trình nghiên cứu sinh học
• tài liệu về sinh học