Comparisons of Specific Two-and Three-Way Crosses of Swine

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Abstract
Comparisons of specific two- and three-way crosses were made. Crossbred pigs were produced from all possible reciprocal crosses of the Duroc (D), Yorkshire (Y) and Hampshire (H) breeds of swine. Two-way cross females were retained from these litters and mated to the third breed of boar or to Poland (P) boars. These data included records on 2,905 pigs from 352 litters. Among the two-breed crosses, breed of dam effects were nonsignificant for litter size and pig survival. However, Y dams farrowed slightly larger litters (10.08) than D (9.33) or H (9.08) dams. Also their pigs had a higher survival rate (Y-86%; D-83.3%; H-83.7%). Pigs from Y dams were smaller (P<01) at birth and weaning. Breed of sire effects were nonsignificant for preweaning traits. However, the H sired pigs had a lower survival rate (80.8%) than D (88.2%) or Y (84.0%) sired pigs. Breed of sire and breed of dam were significant for 140-day weight and backfat. Hampshire sired pigs were the lightest and had the least backfat, while D sired pigs were the heaviest and intermediate in fatness. Differences in total litter weight at 140 days were nonsignificant. Average litter weight ranged from 530 (H-D) to 734 (D-Y) kg among the two-way crosses. Among the three-way crosses, breed of sire was significant for all traits except litter size born and 140-day weight. Poland sired pigs had the lowest survival rate (80 vs 88%) and hence the lowest average litter weight at 140 days. Yorkshire and P sired pigs were fattest at 140 days of age while the H and D sired pigs were the leanest. Copyright © 1976. American Society of Animal Science . Copyright 1976 by American Society of Animal Science.

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