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Effects of High and Low Feeding at Two Stages of the Estrous Cycle on Follicular Development in Gilts from Four Genetic Groups¹

University of Wisconsin, Madison 53706

Abstract

The effects of full and limited-feeding on reproductive phenomena were studied in Poland China, Yorkshire and their reciprocal cross-bred gilts. Full-feeding was applied from either day-10 to day-15 or from day-15 to estrus. Gilts of the former group were slaughtered either on day-15 or on day of estrus. Full-feeding from day-10 to day-15 increased the weight of follicular fluid and decreased the ratio of the number of small follicles to the number of medium follicles at day-15. However, these effects were lost by estrus after reducing the feeding level from day-15 to estrus. Full-feeding for the last 4 to 6 days of the estrous cycle increased the weight of follicular fluid and the number of large follicles and lessened the ratio of the number of small to the mean number of medium and large follicles. Evidence of heterosis was shown in the weight of follicular fluid at day-15, the crossbred value exceeding that of the greater parent. Although the pure-breds were not found to differ at day-15, differences were shown at estrus in several follicular components.

¹ This work was done under a cooperative agreement between the Research Division of the College of Agriculture and Life Sciences, University of Wisconsin, and the Animal Husbandry Research Division, A.R.S., U.S.D.A., and supported in part by Cooperative U.S.D.A.-C.S.R.S. Grants No. 816-15-20 and 916-15-02. It was also supported in part by the Ford Foundation, Grant No. 63-0505A and by the Program Project in Genetics, Grant No. GM 15422, from the National Institutes of Health. This is paper No. 1537 from the Laboratory of Genetics and No. 608 from the Department of Meat and Animal Science.