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Observed Associations between Corpora Lutea and Follicular Development in Swine Ovaries during the Estrous Cycle¹

University of Wisconsin, Madison 53706

⁵ Address for reprint request: Department of Meat and Animal Science, University of Wisconsin, Madison 53706.

Abstract

The interovarian relationship of the number of corpora lutea with ovarian fluid weight, with number of follicles, with number of normal follicles and with number of milky follicles was studied at three different phases of the estrous cycle in sows. There was a significant association (exceeding that which would arise because of the inequality of function between the two ovaries) between-ovaries within sows of the number of corpora lutea and the ovarian fluid weight at the early (r = .34, P<.01) and late (r = .34, P<.01) luteal phases of the estrous cycle. The relationship for the late follicular phase (r = .09) was not significant. Correlation coefficients for the early and late luteal phases of the cycle differed (P<.025) from that of the late follicular phase. Significant associations between-ovaries of the number of corpora lutea with the number of follicles and with the number of milky follicles were found during the late luteal phase of the cycle (r = .25, P<.01; r = –.37, P<.05, respectively), but they could be accounted for as arising from the inequality of function between the two ovaries. These data indicate that an interovarian relationship exists between the number of corpora lutea and follicular development as measured by ovarian fluid weight during the luteal phase of the estrous cycle, but this relationship was not established for the late follicular phase of the estrous cycle.

¹ This research was conducted 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, 63-505A, by the Program Project in Genetics, Grant No. GMI5422, from the National Institutes of Health and by Public Health Service Training Grants No. 5-TO1-HD00104-09 and 5-TO1-HD00104-07. This is paper No. 640 from the Department of Meat and Animal Science and No. 1744 from the Laboratory of Genetics.

² Present address: Wisconsin Regional Primate Research Center, University of Wisconsin, Madison 53706.

³ Present address: Department of Physiology, Emory University, Atlanta, GA 30322.

⁴ Present address: U.S. Range Livestock Experiment Station, Miles City, MT 59301.