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Effect of Short-Term "Flushing" on Follicular Development at Estrus and Ovulation Rate of Gilts of Different Genetic Groups¹

University of Wisconsin, Madison 53706

⁴ Address for reprint request: Department of Meat and Animal Science, University of Wisconsin, Madison 53706.

Abstract

Two separate studies were conducted to determine the effect of 4 days of full-feeding on the ovarian follicular development of gilts at estrus (day 0 of the estrous cycle) or on the subsequent ovulation rate. Ninety-eight gilts from nine genetic groups were assigned to the following treatments: (1) limited-fed (1.82 kg/day) for an entire estrous cycle, (2) full-fed (ad libitum) for 4 days beginning on day-14 of the estrous cycle, or (3) full-fed for 4 days beginning on day-16. At estrus the numbers of large follicles ( 7 mm) were not significantly different among the treatment groups. Genetic differences were found in the numbers of large follicles and the proportions of atretic follicles. However, the various genetic groups responded similarly to the treatments. In the second study which utilized 51 gilts, full-feeding for approximately 4 days beginning on either day-14 or day-16 of the estrous cycle failed to alter significantly the ovulation rate from that of limited-fed gilts.

¹ This work was done under a cooperative agreement between the Research Division of the College of Agricultural 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. 63-505, by the Program Project in Genetics, Grant No. GM 15422, from the National Institutes of Health and by the Public Health Service Training Grant No. 5-TO1 HD00104-09. This paper is No. 642 from the Department of Meat and Animal Science and No. 1746 from the Laboratory of Genetics.

² Present address: Department of Physiology, Emory University, Atlanta, GA 30322.

³ Present address: Wisconsin Regional Primate Research Center, University of Wisconsin, Madison 53706.