Data from 3426 pigs born in 324 litters were analyzed to present a retrospective evaluation of pure breeding, 2-breed crossing, and 3-breed rotational crossbreeding in the sixties and seventies. Heterosis effect was not observed for litter size and the average 10 pigs/litter remained constant as crossbreeding intensified and the management system improved. Sex ratio was not influenced by parental crossing and no sex ratio biases occured throughout the study. Purebred Hampshire pigs were heavier at birth and weaning than purebred Durocs. Offspring of the crossbred dams sired by Duroc or Yorkshire boars were comparable in birth and weaning weights, but weighed less than those sired by Landrace boars. Effect of birth weight on weaning weight was consistently positive whereas litter size influenced weaning weight in a negative manner. Pig survival was not dependent on parental crossing and did not change over the years when crossbreeding intensified.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume X. Breeding programs for swine, poultry, and fish., , 63–69, 1986
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