Non-additive genetic effects on weights and performance of a Brazilian Bos taurus x Bos indicus beef composite

• Autor(a) principal: Mourao, G. B.
• Data de Publicação: 2008
• Outros Autores: Ferraz, J. B. S., Eler, J. P., Bueno, R. S., Balieiro, J. C. C., Mattos, E. C., Figueiredo, L. G. G. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.4238/vol7-4gmr501; http://hdl.handle.net/11449/14118
• topic: Beef cattle; Crossbreeding; Heterosis; Performance

The aim of the present study was to evaluate the heterosis effects on weaning weight at 205 days (WW, N = 146,464), yearling weight at 390 days (YW, N = 69,315) and weight gain from weaning to yearling (WG, N = 59,307) in composite beef cattle. The fixed models were: RM, which included contemporary groups, class of age of dam, outcrossing percentages for direct and maternal effects, and additive direct and maternal ( AM) breed effects; R, RM model, minus AM breed effects, and H, RM model, minus additive breed effects. The estimates for W205 were in general positive (P < 0.01). The R and H models resulted in similar estimates, but they were very different from the ones estimated by the RM model. For W390, the R and H models resulted in general positive estimates (P < 0.05). For WG, the RM model resulted in general significant heterosis effects (P < 0.05). It can be concluded that the RM model seems to supply estimates of better quality (P < 0.01).