Two hundred Landrace × Large White sows were used to evaluate the influence of mating to Landrace or hybrid boars, at different intervals and with different frequencies, on subsequent reproductive performance. Sows were allocated at random to either a mating on each of the first 2 days of oestrus (double mating), two matings on the 1st day and one on the 2nd, one on the 1st day and two on the 2nd or single matings on each of the first 3 days of oestrus. All triple mating systems increased number of piglets born and born alive, with mating on 3 consecutive days significantly influencing these parameters compared with double mating (P < 0·05). Number of piglets weaned and mean piglet weaning weight were not affected significantly by treatment. Breed of boar used did not influence significantly any of the factors measured.