This work aims to evaluate the importance for the age at first farrowing in swine of the inclusion of maternal genetic effects and of the common litter environmental effects in the animal model. The results may indicate that it is not necessary to include the maternal genetic effect and, on the other hand, the importance of the common litter effect, that was responsible for 19% of the phenotype variation. Regarding the heritability estimates, it was observed that the inclusion of the common litter effect caused a reduction in the estimates. The heritability value obtained for the age at first farrowing indicates that this trait may present a genetic gain as a selective response. The common litter effect showed to have an important influence on this trait and should therefore be taken into consideration in the models, for a better estimation of the genetic parameters.

Cavalcante A. Neto, J. F Lui, M. N Ribeiro, J. LR Sarmento, J. MC Monteiro, H. Tonhati

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 06.37, 2006
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