J. Anim Sci.
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Published online first on May 23, 2008
J. Anim Sci. 1910. doi:10.2527/jas.2007-0823
© 2008 American Society of Animal Science
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Models for genetic evaluation of Nelore cattle mature weight

A. A. Boligon§ , L G. Albuquerque§, M. E. Z. Mercadante* and R. B. Lôbo{dagger}

§ Faculdade de Ciências Agrárias e Veterinárias, UNESP. 14884-000-Jaboticabal (SP), Brazil , * Instituto de Zootecnia - Estação Experimental de Zootecnia de Sertãozinho. 14.160-000-Sertãozinho (SP), Brazil {dagger} Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Brazil

lgalb{at}fcav.unesp.com.br

Abstract

Records of 18,770 Nelore animals, : born from 1975 to 2002 in 8 herds participating in the Nelore Cattle Breeding Program, were analyzed to estimate genetic parameters for mature weight. The mature weights were analyzed as a single weight taken closest to 4.5 yr of age for each cow in the data file, considering weights starting from 2 (W2Y_S), 3 (W3Y_S), or 4 (W4Y_S) yr of age or as repeated records, including all weights starting from 2 (W2Y_R), 3 (W3Y_R), or 4 (W4Y_R) yr of age. The variance components were estimated by restricted maximum likelihood, fitting univariate and bivariate animal models, including weaning weight. The heritability estimates were 0.29; 0.34; 0.36; 0.41; 0.44; and 0.46 for W2Y_S; W3Y_S; W4Y_S; W2Y_R; W3Y_R; and W4Y_R, respectively. The repeatability estimates for W2Y_R, W3Y_R, and W4Y_R were 0.59; 0.64; and 0.72, respectively. Larger accuracy values associated with the estimated breeding values were obtained in repeated records models. The results indicated the bivariate repeated records model as the most appropriate for analyzing mature weight.

Key Words: Key words: beef cattle • genetic correlation • growth • repeatability






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