Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Genetic parameters for first lactation dairy traits in the Alpine and Saanen goat breeds | Genet. Sei. Evol. 1989 21 205-215 Elsevier INRA 205 Original article Genetic parameters for first lactation dairy traits in the Alpine and Saanen goat breeds D. Boichard2 N. Bouloc1 G. Ricordeau 1 A. Piacere3 and F. Barillet1 11nstitut National de la Recherche Agronomique Station d Amelioration Génétique des Animaux Centre de Recherches de Toulouse BP 27 31326 Castanet Cedex France 2 Institut National de la Recherche Agronomique station de Génétique Quantitative et Appliquée Centre de Recherches de Jouy 78350 Jouy-en-Josas France 3 Association Nationale de Génétique Caprine SAGA BP 27 31326 Castanet Cedex France received 26 August 1987 accepted 17 June 1988 Summary Genetic parameters for dairy traits in first lactation milk yield fat and protein yields fat and protein contents were estimated by restricted maximum likelihood in the Alpine and Saanen goat breeds from records including progeny of 473 and 238 unproven bucks respectively mainly used in natural mating. The differences between breeds could also be estimated when the flocks used both breeds. The sampling of the data sets the addition of data from 28 and 22 progenies of Al proven sires and the relationship matrix between sampling sires contributed to increase the connection level between flocks which however remained rather low. In the same environmental conditions particularly in the same year-flock the Saanen breed appeared more high-yielding than the Alpine but solid content was lower. Within-breed the genetic standard deviation was fold larger for fat content than for protein content. The heritability of fat and protein yields was rather high to . The genetic correlations between yields were larger than . They were generally negative but rather low to between milk yield and contents. They were clearly positive between fat yield and content to and between protein yield and content to . They were close to zero and possibly positive between the yield of one
