Influence of Nutritional Regime on Age at Puberty in Gilts

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Abstract
Age at puberty was determined for 205 Gene Pool gilts; 68 fed a 10% protein diet (HLC) consisting of high-lysine corn, minerals and vitamins and 137 fed a 14% protein corn soybeam meal diet (CS). Gilts fed the CS diet reached puberty 18.7 days earlier than gilts fed the HLC diet. Use of postweaning daily gain as a covariable reduced the difference between diets to 9 days. The pooled within diet regression of age at puberty on post-weaning gain was −22.75 days per kilogram. The correlation between pubertal age and daily gain was significantly higher on the HLC diet (−.30 vs. −.57; P<.025) but the regressions for the two diets did not differ significantly (−26.0 vs. −18.4 days per kilogram). Daughter-dam regressions were calculated for each diet separately. The coefficient for the 14% protein diet (0.32) was significantly higher than for the 10%protein diet (−.14) indicating the existence of a genotype-environment interaction. Copyright © 1974. American Society of Animal Science . Copyright 1974 by American Society of Animal Science.

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