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Maintenance of Unilateral Pregnancy in the Pig with Induced Corpora Lutea^{1, 2,}

Missouri Agricultural Experiment Station, Columbia 39762

Abstract

PREVIOUS studies have shown that the presence of a non-pregnant uterine horn in the pig usually results in pregnancy failure (du Mesnil du Buisson, 1961a; Anderson, Rathmacher and Melampy, 1966). It is not known why a non-pregnant segment of the uterus will interrupt pregnancy. In those animals that remain pregnant, there is a high incidence of unilateral regression of the corpora lutea adjacent to the non-pregnant uterine horn (du Mesnil du Buisson, 1961a; Anderson et al, 1966) which strongly suggests that the uterine horn can exert a local luteolytic effect. Further, there is evidence to suggest that the failure of pregnancy in gilts with a non-pregnant uterine horn is due to a systemic luteolytic effect that may have been local in action, initially (du Mesnil du Buisson, 1961b). Although there is support for this hypothesis, there has been little attention given to the question of whether the failure of the corpora lutea in the ovary adjacent to the pregnant uterine horn precedes, or follows, death of the embryos.

¹ Contribution from the Missouri Agricultural Experiment Station. Journal Series No. 5999. Approved by the Director.

² This investigation was supported in part by a PHS Training Grant No. HD-00170 from the National Institutes of Health, Public Health Service. The authors express their appreciation to Ayerst Laboratories, New York, N. Y., for providing the PMS used in this study and to Mrs. Betty Nichols for secretarial assistance.

³ This paper represents part of a thesis submitted by the senior author to the Graduate School, University of Missouri, in partial fulfillment of the requirements for the Ph.D. degree. Present address: Animal Science Department, Ohio Agricultural Research and Development Center, Wooster.