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Lookup NU author(s): Dr Helio Lima Neto
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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.
Author(s): Lima-Neto HR, Bergmann JAG, Goncalves TM, Araujo FRC, Bezerra LAF, Saiz RD, Lôbo RB, Silva MA
Publication type: Article
Publication status: Published
Journal: Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Year: 2009
Volume: 61
Issue: 1
Pages: 251-258
ISSN (print): 0102-0935
Publisher: Escola de Veterinaria, Universidade Federal de Minas Gerais
URL: http://dx.doi.org/10.1590/S0102-09352009000100035
DOI: 10.1590/S0102-09352009000100035
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