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Interrelationships of Swine Weights at Three Ages¹

University of Nebraska and Purdue University

Abstract

The interrelationships of birth, 56-day and 154-day weights for 1894 pigs raised at the Indiana and two Nebraska experiment stations are presented. The average within-litter correlations were. birth-weaning weight 0.53, birth-154-day weight 0.40, and 56-day-154-day weight 0.63. The coefficient of determination (r²) of the 56-day weight on 154 day weight is .40 indicating that a knowledge of 56-day weight accounts for only 40 percent of the variance in 154-day weight. Selecting heavy pigs at 56-days in order to increase weight at 154-days can thus be expected to have only a low efficiency. Due principally to number of pigs, the relationship between total litter weights at 56 and 154 days of age is high.

¹ Published with the approval of the director as Paper No. 627, Journal Series, Nebraska Agricultural Experiment Station and as Contribution from the Department of Animal Husbandry, Journal Paper No. 771, Purdue University Agricultural Experiment Station, Lafayette, Indiana. In cooperation with the Regional Swine Breeding Laboratory, Ames, Iowa, Bureau of Animal Industry, U. S. D. A.

² University of Nebraska.

³ Purdue University.

⁴ Present address Regional Coordinator, S-10, Beef Cattle Breeding, University of Tennessee, Knoxville, Tennessee.