Abstract
In three populations of Dutch Landrace (DL), Duroc and (Duroc∗DL) sows, vigorously aggressive behaviour of about 8% of primiparous sows against their own piglets during or immediately after farrowing resulted in a decrease of litter size at weaning of almost two piglets per litter. Genetic analysis was performed on this trait, scored as an all-or-none characteristic (the sow is aggressive or not). In the purebred populations, heritability ( h 2) estimates from paternal half sib (PHS) and from daughter-dam (DD) analysis ranged between 0.4 and 0.9, indicating significant additive genetic effects; PHS and DD h 2 estimates were negative in the crossbred sow population. It is concluded that sow aggressiveness is a heritable character.
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