Boligon, A. A. [UNESP]Albuquerque, Lucia Galvão de [UNESP]Mercadante, M. E. Z.Lobo, R. B.2014-05-202014-05-202008-11-01Journal of Animal Science. Savoy: Amer Soc Animal Science, v. 86, n. 11, p. 2840-2844, 2008.0021-8812http://hdl.handle.net/11449/4492Records 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 BW. The mature BW were analyzed as a single BW taken closest to 4.5 yr of age for each cow in the data file, considering BW starting from 2 (W2Y_S), 3 (W3Y_S), or 4 (W4Y_S) yr of age or as repeated records, including all BW 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 EBV were obtained in the repeated records models. The results indicated the bivariate repeated records model as the most appropriate for analyzing mature BW.2840-2844engBeef cattleGenetic correlationGrowthrepeatabilityArtigo10.2527/jas.2007-0823WOS:000260425000003Acesso restrito5866981114947883