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Amounts of gonadotrophins required for normal follicular growth in hypophysectomized adult rats.

Rats were hypophysectomized at oestrus, at days i, 2 and 3 of dioestrus or at pro-oestrus. They were injected with various doses of PMS only, or of combinations of PMS and HCG, in such a way that rather constant blood levels could be expected. They were killed 24 hours later. It was found that the minimal doses of the substitutional gonadotrophins required to maintain normal follicular growth, were considerably higher during the period from prooestrus to oestrus (when a new generation of follicles starts its development) than during all other periods. This peak requirement primarily concerned PMS. The minimal requirement during other periods only showed minor variations. The data suggest that during prooestrus very high amounts of FSH are required to recruit a new crop of follicles, whereas during the other phases low levels of both FSH and/or I,H are a requirement for normal follicular growth.