TAILIEUCHUNG - Báo cáo sinh học: "Bayesian segregation analysis of milk flow in Swiss dairy cattle using Gibbs sampling"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Bayesian segregation analysis of milk flow in Swiss dairy cattle using Gibbs sampling | Genet. Sel. Evol. 36 2004 563-576 INRA EDP Sciences 2004 DOI gse 2004017 563 Original article Bayesian segregation analysis of milk flow in Swiss dairy cattle using Gibbs sampling Houcine Ilahi Haja N. Kadarmideen Statistical Animal Genetics Group Institute of Animal Sciences Swiss Federal Institute of Technology ETH-Zentrum Universitatsstrasse 65 8092 Zurich Switzerland Received 16 February 2004 accepted 21 May 2004 Abstract - Segregation analyses with Gibbs sampling were applied to investigate the mode of inheritance and to estimate the genetic parameters of milk flow of Swiss dairy cattle. The data consisted of 20 4397 655 989 and 40 242 lactation records of milk flow in Brown Swiss Simmental and Holstein cattle respectively 4 to 22 years . Separate genetic analyses of first and multiple lactations were carried out for each breed. The results show that genetic parameters especially polygenic variance and heritability of milk flow in the first lactation were very similar under both mixed inheritance polygenes major gene and polygenic models. Segregation analyses yielded very low major gene variances which favour the polygenic determinism of milk flow. Heritabilities and repeatabilities of milk flow in both Brown Swiss and Simmental were high to and to respectively . The heritability of milk flow based on scores of milking ability in Holstein was intermediate . Variance components and heritabilities in the first lactation were slightly larger than those estimates for multiple lactations. The results suggest that milk flow the quantity of milk per minute of milking is a relevant measurement to characterise the cows milking ability which is a good candidate trait to be evaluated for a possible inclusion in the selection objectives in dairy cattle. segregation analysis Bayesian method major gene milk flow Swiss cattle 1. INTRODUCTION In dairy cattle yields of milk and milk solids are of primary economic concern however other traits .

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