Direct genetic and additive maternal effects on swine litter size and weight in a tropical environment
Keywords:Direct effects, Additive maternal effects, Litter size, Litter weight
AbstractLitter records (totalling 1323) of Large White (LW) and Landrace (LR) pigs and their F1 crosses were analysed to evaluate the direct genetic and additive maternal effects on pre-weaning litter size and weight. Direct genetic effects were important for most litter traits studied. Additive maternal differences were observed for litter weight at 3 weeks of age favouring the crossbreds with LR dams. Direct heterosis effects for litter size and weight at birth were not significant.