Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/42278
Título: Parâmetros genéticos para características de carcaça avaliadas por ultrassonografia em bovinos da raça Guzerá
Título(s) alternativo(s): Genetic parameters for body weight and real-time ultra sound carcass traits of Guzera cattle
Palavras-chave: Bovino de corte
Parâmetros genéticos
Peso corporal
Características de carcaça
Beef cattle
Genetic parameters
Body weight
Carcass traits
Data do documento: Fev-2009
Editor: Universidade Federal de Minas Gerais (UFMG), Escola de Veterinária
Citação: LIMA NETO, H. R. et al. Parâmetros genéticos para características de carcaça avaliadas por ultrassonografia em bovinos da raça Guzerá. Arquivo Brasileiro de Medicina Veterinária e Zootecnia, Belo Horizonte, v. 61, n. 1, p. 251-258, fev. 2009. DOI: 10.1590/S0102-09352009000100035.
Resumo: Genetic parameters were estimated for body weight and real-time ultra-sound loin-eye area, rump fat thickness, and back fat thickness using data from 1,325 yearling Guzera cattle (90.4% bulls and 9.6% heifers) and pedigree structure with 6,642 animals. Variance and covariance components were estimated using REML methodology and MTDFREML software. Single trait animal models were used to estimate repeatability and heritability for the four traits. Multiple traits animal models were used to estimate genetic correlations among the traits. Repeatability estimates (standard errors) were 0.44(0.10) for body weight, 0.39(0.10) for loin-eye area, 0.75(0.06) for rump fat thickness, and 0.49(0.08) for back fat thickness. Heritability estimates were 0.42(0.11) and 0.41(0.11) for body weight, 0.35(0.09) and 0.34(0.09) for loin-eye area, 0.20(0.08) and 0.32(0.08) for back fat thickness, and 0.05(0.06) and 0.10(0.08) for rump fat thickness, respectively from single and multiple traits models. Genetic correlation estimates were 0.79(0.09) between body weight and loin-eye area, 0.20(0.08) between body weight and back fat thickness, 0.05(0.06) between loin-eye area and rump fat thickness, 0.02(0.27) between loin-eye area and back fat thickness and 0.64(0.22) between the two measurements of fat thickness. In order to evaluate carcass traits, results suggested that repeated real-time ultra-sound measurements are not needed and that direct selection for these traits might be effective. In addition, there is no genetic antagonism between selection for body weight and carcass traits.
URI: http://repositorio.ufla.br/jspui/handle/1/42278
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