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Unilateral Effect of Induced Uterine Infection on Luteal Development in the Ewe

U.S. Department of Agriculture, Beltsville, Maryland^,2

Abstract

Two experiments were conducted to determine if the luteolytic effect of induced uterine infection in the ewe involved a local utero-ovarian component. Sterile saline solution or a suspension of E. coli was injected into one uterine horn of 46 ewes on the day after estrus. Ewes were killed 6 days after treatment. In the first experiment, infection induced in one ligated horn, either adjacent or opposite to an ovary with a new ovulation, inhibited CL development in both ovaries. In the second experiment, one uterine horn was severed approximately 1 cm. anterior to the uterine body and the cut ends were ligated and tied apart to prevent passage of inflammatory substances to the opposite horn. In these ewes, CL development was consistently inhibited in the ovary adjacent to the infected horn but not in the opposite ovary. These results suggest that the luteolytic effect of induced uterine inflammation in the ewe involves a unilateral component.

¹ The technical assistance of D. K. Higginbotham is greatly appreciated.

² Animal Husbandry Research Division.