Abstract
Ewes were treated with a luteolytic agent on Day 14 of the estrous cycle. Their largest follicle was identified 30 hr later. Thirty-six hr post-treatment, ewes received an injection of an analog of luteinizing hormone-releasing hormone (LHRHa). The peak in the induced surge of LH occurred 2 to 4 hr after injection of LHRHa. Ovulation occurred from the largest follicle approximately 24 hr following administration of LHRHa. During the subsequent luteal phase, serum concentrations of progesterone were normal. The treatment regimen described is well-suited for collection of follicles at precisely-timed periovulatory intervals. Perhaps information gained by using this model will be useful in ultimately understanding the follicular events associated with ovulation and function of the corpus luteum.
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