Interacción genotipo x ambiente sobre el peso al destete de bovinos nelore en Brasil

• Autor(a) principal: Souza, J. C.
• Data de Publicação: 2008
• Outros Autores: Doska, M. C., Silva, L. O C, Gondo, A., Ramos, A. A. [UNESP], Malhado, C. H M, Santos, I. W., Freitas, J. A., Ferraz Filho, P. B., Sereno, J. R B
• Tipo de documento: Artigo
• Idioma: spa
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.uco.es/organiza/servicios/publica/az/php/img/web/16_14_47_09InteraccionSouza.pdf; http://hdl.handle.net/11449/70489
• topic: Genetic parameters; Pantanal; Trends; Zebu; Animalia; Bos; Bos indicus

The objectives of this study were to evaluate the genotype x environmental interactions and estimates of genetic parameters for weaning weight (P205) in two Brazilian regions. Weights of Nellore calves (n= 46 390) were collected over a 27 year period, on 398 farms in the regions of Pantanal and Goiás. The MTDFREML program was used for estimation of variances components. The statistical model has a fixed effect of contemporary groups (farm, sex, season and year of birth) and age of dam at parturition (quadratic); random effects of direct genetics effects, maternal genetic effects and permanent environmental effects. The genetic correlation for weaning weight in Pantanal and Goiás was 0.61, evidence of the genotype x environmental interaction. The direct and maternal heritabilities and genetic trend were 0.34, 0.07 and 8.4 kg and 0.27, 0.09 and 11.8 kg. for animals raised in Pantanal and Goiás, respectively.