Genetic trends in the expected progeny difference of the asymptotic weight of Nelore females
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
20/05/2014
20/05/2014
01/01/2006
|
Resumo |
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) There are few studies on weight covering the full life cycle of Zebu cattle, and there is no entire growth description or mean growth pattern for animals belonging to this breed. In order to provide such data, 1,158 Nelore females born between 1985 and 1995 were weighed 14,563 times from birth to full growth maturity, in ten herds spread over seven Brazilian states. The Von Bertalanffy, Brody, logistic and Gompertz non-linear models were used to obtain the asymptotic weights (A) and the maturation rates (K). The (co)variance and breeding value components for A and K were obtained by using the multiple trait derivative free restricted maximum likelihood method under the animal model. Genetic trends were calculated in function of the mean expected progeny differences (EPD) for the trait (A or K) divided by the number of animals according to their year of birth. The genetic trends of the expected progeny difference with reference to the date of birth of the cows were, on average, -6.5g y-1 for A and 2.0g y-1 for K, close to zero as confirmed by the low (0.0023 to 0.003) coefficient of regression values. The curve parameters are recommended as a selection criterion to reach precocity and avoid adult weight increase in the female herd. |
Formato |
648-652 |
Identificador |
http://dx.doi.org/10.1590/S1415-47572006000400012 Genetics and Molecular Biology. Sociedade Brasileira de Genética, v. 29, n. 4, p. 648-652, 2006. 1415-4757 http://hdl.handle.net/11449/30488 10.1590/S1415-47572006000400012 S1415-47572006000400012 S1415-47572006000400012.pdf |
Idioma(s) |
eng |
Publicador |
Sociedade Brasileira de Genética |
Relação |
Genetics and Molecular Biology |
Direitos |
openAccess |
Palavras-Chave | #adult weight #Bovines #Genetic trends #maturation rate #simulation with growth curves |
Tipo |
info:eu-repo/semantics/article |