Título:	Effect of age of dam on weight of calf in the genetic assessment of Zebu cattle in random regression models
Outros títulos:	Efeito da idade da vaca à pesagem da progênie na avaliação genética de bovinos Guzerá em modelos de regressão aleatória
Autor(es):	Ferreira, Jorge Luís Lopes, Fernando Brito Bresolin, Tiago Garcia, José Américo Soares Minharro, Silvia Lôbo, Raysildo Barbosa
Assunto:	Gado - genética Bovino
Data de publicação:	Abr-2015
Editora:	Editora da Universidade Estadual de Maringá - EDUEM
Referência:	FERREIRA, Jorge Luís et al. Effect of age of dam on weight of calf in the genetic assessment of Zebu cattle in random regression models. Acta Scientiarum. Animal Sciences, Maringá, v. 37, n. 2, p. 203-208, abr./jun. 2015. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1807-86722015000200203&lng=en&nrm=iso>. Acesso em: 23 mar. 2018. doi: http://dx.doi.org/10.4025/actascianimsci.v37i2.25355.
Abstract:	Current analysis estimated co-variance components and genetic parameters for growth traits by random regression models taking into consideration the cow's age on the weight of calves. Genealogical data and records on weights of male and female Zebu cattle, born between 1993 and 2011, were provided by the National Association of Breeders and Researchers (ANCP). Different models were compared by Akaike and Bayesian criteria. Legendre's orthogonal polynomials were used to model the direct and maternal genetic effects of maternal and animal permanent environmental effects. Joint modeling of cow age at the moment their progenies were weighed resulted in more accurate estimates of co-variance components and genetics parameters. Co-variance functions of the cow age retrieved the dam effect on real performance of the progenies, reduced biases, improved parameter estimates and predicted breeding rates.
Unidade Acadêmica:	Faculdade de Agronomia e Medicina Veterinária (FAV)
Licença:	License information: This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
DOI:	http://dx.doi.org/10.4025/actascianimsci.v37i2.25355
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