On the basis of the data from 574 litters of Landrace × Large white × Duroc breeds farrowde at sanji Swine Farm were statistically analysed by least squares method to compare the reproductive performance of mating types, parity and calving season. D...
On the basis of the data from 574 litters of Landrace × Large white × Duroc breeds farrowde at sanji Swine Farm were statistically analysed by least squares method to compare the reproductive performance of mating types, parity and calving season. D × LYD has the best performance in the litter size at birth and the litter at weaning and number of pigs weaned were higher than other mating types(P<0.05). Compare to the reproductive performance by parity, the litter size at birth, letter size at weaning and number of pigs weaned of parity was lower than other parities(P<0.05). Compare to the reproductive performance by calving season the letter size at birth, letter size at weaning and number of pigs weaned were lowest in summer season(P<0.05).