Data/hora: 10/06/2024 19:07:48

Provedor de dados: | Revista Brasileira de Zootecnia
País: | Brazil
Título: | Estimates of covariance functions for growth of Anglo-Nubian goats
Autores: | Sousa,José Ernandes Rufino de; Silva,Martinho de Almeida e; Sarmento,José Lindenberg Rocha; Sousa,Wandrick Hauss de; Souza,Maria do Socorro Medeiros de; Ferreira,Isabel Cristina.
Data: | 2011-01-01
Ano: | 2011
Palavras-chave: | Covariance function; Genetic parameter; Goat; Legendre polynomial.
Resumo: | It was used 4,313 weight records from birth to 196 days of age from 946 Anglo-nubiana breed goats, progenies from 43 sires and 279 dams, controlled in the period from 1980 to 2005, with the objective of estimating covariance functions and genetic parameters of animals by using random regression models. It was evaluated 12 random regression models, with degrees ranging from 1 to 7 for direct additive genetic and maternal and animal permanent environment effect and residual variance adjusted by using animal age ordinary polynomial of third order. Models were compared by using likelihood ratio test and by Bayesian information criterion of Schwarz and Akaike information criterion. The model selected based on Bayesian information criterion was the one that considered the maternal and direct additive genetic effect adjusted by a quadratic polynomial and the animal permanent environmental effect adjusted by a cubic polynomial (M334). Heritability estimates for direct effect were lower in the beginning and at the end of the studied period and maternal heritability estimates were higher at 196 days of age in comparison to the other growth phases. Genetic correlation ranged from moderate to high and they decreased as the distance between ages increased. Higher efficiency in selection for weight can be obtained by considering weights close to weaning, which is a period when the highest estimates of genetic variance and heritability are obtained.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000100015
Editor: | Sociedade Brasileira de Zootecnia
Relação: | 10.1590/S1516-35982011000100015
Formato: | text/html
Fonte: | Revista Brasileira de Zootecnia  v.40 n.1 2011
Fonte: | info:eu-repo/semantics/openAccess