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Two factorial experiments have been conducted with corn–soybean diets. Four types of pigs and three "sexes": males, females and castrated males, were used. The first experiment showed that Lacombe and Yorkshire strains responded to an increase in dietary protein from 13 to 16% by growing faster, whereas Landrace and a crossbred strain did not. The males grew faster than the females. In the second experiment, the effects of adding lysine and/or methionine to diets containing either 12 or 14% protein were investigated. There was no significant improvement in gain or feed efficiency when either amino acid was added separately, but there was a substantial response when they were added together. Landrace, Yorkshire and Hampshire × Landrace pigs were used in this experiment and the Landrace gained more slowly than the other two types.

EFFECT OF PROTEIN LEVEL AND LYSINE AND METHIONINE SUPPLEMENTATION ON THE PERFORMANCE OF GROWING PIGS: RESPONSE OF DIFFERENT SEXES AND STRAINS OF PIGS