EFFECT OF SEVERAL STRUCTURES OF CONTEMPORARY GROUPS ON ESTIMATES OF (CO)VARIANCE AND GENETIC PARAMETERS FOR WEANING WEIGHT IN NELLORE CATTLE

Authors

  • Lillian Pascoa Instituto Federal de Educação Ciência e Tecnologia de Brasilia, Planaltina, Distrito Federal, Brasil
  • Arcadio de los Reyes Universidade Federal de Goiás (UFG), Goiânia, Goiás, Brasil
  • Mauricio A. Elzo Department of Animal Sciences, University of Florida, Gainesville, Florida
  • Jorge Luiz Ferreira Universidade Federal do Tocantins (UFT), Araguaína, Tocantins, Brasil
  • Luiz A.F. Bezerra Universidade de São Paulo(USP), São Paulo, São Paulo, Brasil
  • Raysildo Barbosa Lobo Associação dos Criadores e Pesquisadores, Ribeirão Preto, São Paulo Brasil

Keywords:

Animal breeding

Abstract

We used actual and adjusted weights to 120 d and 210 d of age of 72,731 male and female Nellore calves born in 40 PMGRN - Nellore Brazil herds from 1985 to 2005 aiming to compare the effect of different definitions of contemporary groups on estimates  of (co)variance and genetic parameters. Four models, each one with a different structure of contemporary group (CG), were compared using the Akaike Information Criterion (AIC), the Bayesian Information Criterion (BIC), and the Consistent Akaike Information Criterion (CAIC). (Co)variance estimates were obtained using a derivative-free restricted maximum likelihood procedure. Estimates of (co)variances and genetic parameters were similar for the four models considered. However, the BIC and CAIC indicated that the most appropriate model for this Nellore population was the one that considered CG to be random, and sex of calf to be fixed and separate from CG, in which CG was defined as the group of calves born in the same herd, year, season of birth (trimester), and undergone the same management.

KEYWORDS: beef cattle; contemporary groups; information criteria.

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Published

2013-06-27

How to Cite

PASCOA, Lillian; REYES, Arcadio de los; ELZO, Mauricio A.; FERREIRA, Jorge Luiz; BEZERRA, Luiz A.F.; LOBO, Raysildo Barbosa. EFFECT OF SEVERAL STRUCTURES OF CONTEMPORARY GROUPS ON ESTIMATES OF (CO)VARIANCE AND GENETIC PARAMETERS FOR WEANING WEIGHT IN NELLORE CATTLE. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 14, n. 2, p. 151–158, 2013. Disponível em: https://revistas.ufg.br/vet/article/view/13571. Acesso em: 21 dec. 2025.

Issue

Vol. 14 No. 2 (2013)

Section

Animal Production

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Copyright (c) 2013 Brazilian Animal Science/ Ciência Animal Brasileira

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