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Local Effect of an Intrauterine Plastic Coil on the Corpus Luteum of the Ewe¹

University of Wisconsin, Madison

Abstract

A polyethylene plastic coil was inserted surgically into the cranial portion of one Uterine horn of each of 26 mature ewes. Insertions were made on day 4 of an estrous cycle, and the ewes were autopsied on day 6 of a subsequent cycle.

The length of the operative estrous cycle, when the relationship of coil location to side of ovulation was known, was shorter (P<.05) for the seven ewes which had ovulated on only the operative side (ave. = 12.0 days) than for the 11 ewes which had ovulated on only the nonoperative side (ave. = 17.8 days).

Eighteen ewes had one or two CL in only one ovary at the time of autopsy on day 6. The average weight of the CL in the 11 ewes which had CL on only the operative side was less (P<.01) than the average weight of CL of the seven ewes which had CL on only the nonoperative side. Eight ewes had one or two CL in both ovaries at time of autopsy. The average weight of CL on the operative side was less (P<.01) than for those on the non-operative side.

This experiment demonstrates that a plastic coil in the cranial portion of one uterine horn of the ewe exerts a unilateral "inhibitory" influence on the CL.

¹ Paper No. 1055 from the Genetics Laboratory and No. 433 from the Department of Meat and Animal Science. Published with the approval of the Director of the Agricultural Experiment Station. This work was done under a cooperative agreement between the Wisconsin Agricultural Experiment Station and the Dairy Cattle Research Branch, U.S.D.A. The work was supported in part by the Branch and also by a grant from the Ford Foundation.

² Supported by Public Health Service postdoctoral fellowship, No. 1 F2 HD-23, 054-01, from the National Institute of Child Health and Human Development.