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Sow Productivity Traits of Crossbred Sows^{1 ,2,}

Purdue University, West Lafayette, IN 47907

Abstract

Boar breed, sow cross and breed group effects were evaluated for sow productivity traits including conception rate and litter averages for: litter size, pig livability, pig weight and litter weight. The litters were from crossbred Duroc x Yorkshire (DY), Hampshire x Yorkshire (HY) and Landrace x Yorkshire (LY) sows mated to purebred Duroc (DD), purebred Hampshire (HH), and crossbred Duroc x Hampshire and Hampshire x Duroc (DH) boars. Litter average records were measured for 380 litters represented at marketing. Conception rate averaged 95.1%, through five 30-day breeding periods, for the 505 sow exposures. Differences in conception rate among the different boar and sow cross groups were not significant. Boar breed effects were significant only for one trait-pig market weight; whereas sow cross effects were significant for all litter size traits. The DY sows had the largest litter sizes and weights at 0, 35 and 210 days. Litters from DY and LY sows had 9.8 and 14.4%, respectively, greater livability at 35 days than litters from HY sows. On a per litter marketed basis, the DY sows exhibited advantages in litter weight per sow over HY and LY sows, respectively, of 12.6 and 7.3 kg at 35 days, and 208 and 102 kg at 210 days. Breed group effects were significant for all litter average traits, except litter birth weight and pig weaning weight. The DD x DY group had the largest litter sizes and weights at 0, 35 and 210 days.

¹ Journal Paper No. 7480, Purdue Univ. Agri. Exp. Sta.

² Date derived from the Purdue Univ. contributing project to NC-103 regional project, Genetic Improvement of Efficiency in the Production of Quality Pork.