Bayesian inference on field data for genetic parameters for some reproductive and related traits of Nellore cattle (Bos indicus)

Genetics and Molecular Biology

Carina Ubirajara De Faria²  Cláudio De Ulhôa Magnabosco¹  Arcadio De Los Reyes¹  Raysildo Barbosa Lôbo¹  Luiz Antônio Framartino Bezerra¹  Roberto Daniel Sainz¹ 

[1] ,UNIDERPCampo Grande MS ,Brazil

关键词: bayesian inference;    genetic parameters;    heritabilities;    Nellore cattle;    reproductive traits;   

DOI  :  10.1590/S1415-47572007000300008

来源: SciELO

【 摘 要 】

We used Gibbs sampling in single and two-trait animal models to estimate genetic parameters for some reproductive and related traits of Nellore cattle (Bos indicus). Female traits were age at first calving (AFC), cumulative productivity (CP) and adult weight (AW). For males, scrotal circumferences at 365 and 450 days of age were analyzed. Gibbs sampling using the ‘Multiple Trait using Gibbs Sampling under Animal Model’ (MTGSAM) program of Van Tassel and Van Vleck was used to estimate the (co)variance components of the traits and conduct genetic analyses. Heritabilities were AFC = 0.26, AW = 0.36 and CP = 0.25 under the single-trait animal model. The mean, mode and median estimates for genetic parameters obtained from the marginal posterior distributions were similar for all traits except AW, which presented lower values for the mode than the mean and median. However, the marginal posterior distributions for the traits studied presented a tendency toward normality. Favorable, but low, negative genetic correlations were found between male scrotal circumference and female age at first calving. The reproductive traits showed medium-magnitude heritabilities, which indicates that these traits should respond to selection and therefore should be included in genetic improvement programs.

【 授权许可】

CC BY   
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