The Reaction of Three Kinds of Single-Cross Pigs to Three Levels of Feed Intake I. Feed Lot Performance

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Abstract
Heredity and environment interactions were studied in regard to feed lot performance by subjecting three kinds of crossbred pigs to three feeding treatments in a factorial experiment. The experiment was conducted in two replications with a total of 180 pigs, 10 in each of 18 pens. The crossbred pigs were sired by the Minnesota No. 2, Minnesota No. 3 and Minnesota No. 2A boars and out of Minnesota No. 1 dams. The treatments were full-feeding, 85% restricted feeding, and the self-feeding of a feed mixture containing 20% grass and alfalfa meal and 80% concentrates. The feed lot performance characteristics studied were average daily gain, age at 200 lb., and feed per 100 lb. gain. Significant breeding × treatment interactions were found in average daily gains and in age at 200 lb. live weight. Treatment mean squares were all significant at P=.01 for the three feed lot characteristics—daily rate of gain, age at 200 lbs. and feed per 100 lb. gain. Breeding groups mean squares differed significantly at P=.01 only for feed per 100 lb. gain and were non-significant in the case of daily gain and age at 200 lb. The significant B × T interaction mean squares for daily rate of gain and age at 200 lb. indicate that the relative values of the genetic constitutions of the three different kinds of crosses used in this experiment varied with feeding treatment. Copyright © . .

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