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Evidence for an extraluteal antifolliculogenic action of chorionic gonadotropin in rhesus monkeys.

As shown previously, luteectomy in rhesus monkeys during the nonfertile cycle was followed by a preovulatory LH surge within 2 weeks. In contrast, a LH surge did not occur before the fourth week after luteectomy-induced abortion performed on day 29 of the fertile cycle. To account for the different responses to luteectomy in fertile and nonfertile cycles, we hypothesized that elevated levels of macaque CG (mCG) during the fertile cycle impeded follicle growth after abortion. To test this hypothesis, hCG was administered to three groups of rhesus monkeys in daily doubling doses of 10, 20, 40, and 80 IU/day on days 22, 23, 24, and 25 of the nonfertile cycle to mimic the pattern of mCG in fertile cycles. This regimen promptly and temporarily rescued the corpus luteum (CL) in a control group (group 1; n = 4) and in monkeys in group 2 (n = 4), luteectomized after hCG on day 26. Monkeys in group 3 (n = 4) were luteectomized on day 22, before the first hCG injection. Monkeys in group 4 (n = 5) served as a day of...