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Influence of Nutritional Regime on Age at Puberty in Gilts¹

University of Nebraska, Lincoln 68503

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.

¹ Published with the approval of the Director as Paper No. 3490 Journal Series, Nebraska Agr. Exp. Sta. Research reported was conducted under Project 13-29.

² Present address: Morgan County Community College, Fort Morgan, Colorado.

³ Department of Animal Science.