Use este identificador para citar ou linkar para este item:
https://locus.ufv.br//handle/123456789/31333
Tipo: | Artigo |
Título: | Random regression models with B-splines to estimate genetic parameters for body weight of young bulls in performance tests |
Autor(es): | Scalez, Daiane Cristina Becker Fragomeni, Breno de Oliveira Santos, Dalinne Chrystian Carvalho dos Passafaro, Tiago Luciano Alencar, Maurício Mello de Toral, Fabio Luiz Buranelo |
Abstract: | The objective of this study was to estimate genetic parameters for body weight of beef cattle in performance tests. Different random regression models with quadratic B-splines and heterogeneous residual variance were fitted to estimate covariance functions for body weights of Nellore and crossbred Charolais × Nellore bulls. The criteria −2 residual log-likelihood (−2RLL), Akaike Information Criterion (AIC), and consistent AIC (CAIC) were used to choose the most appropriate model. For Nellore bulls, residual variance was modeled with six classes of age, and direct additive genetic and permanent environment effects were modeled with quadratic B-splines with two and one intervals, respectively. For crossbred bulls, quadratic B-splines with one interval fitted direct additive genetic and permanent environment effects and nine classes of age were needed to fit residual variance. Pooling classes of age with up to 40% in difference of residual variances does not compromise the fit of the model. Heritability for body weight in performance tests are moderate (>0.25, for crossbred bulls) to high (>0.5, for Nellore bulls) and genetic correlation between weights over the test are also high (>0.65). Then, selection of young bulls in performance test is an efficient tool to increase body weight in beef cattle |
Palavras-chave: | animal breeding Bos indicus genetic correlation heritability |
Editor: | Brazilian Journal of Animal Science |
Tipo de Acesso: | Creative Commons Attribution License |
Identificador DOI: | https://doi.org/10.1590/rbz4720150300 |
URI: | https://locus.ufv.br//handle/123456789/31333 |
Data do documento: | 24-Jul-2018 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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1806-9290-rbz-47-e20150300.pdf | artigo | 1,75 MB | Adobe PDF | Visualizar/Abrir |
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