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Immature mice aged 14 to 49 days were treated with a single injection of 4 i.u. HCG, or 3 i.u. PMSG followed 48 hr later by 2 i.u. HCG. After treatment with HCG alone the number of oocytes which were ovulated rose gradually from Day 21 to Day 28 and then remained constant, while the combined PMSG+HCG treatment induced a peak response between Days 24 and 28. The percentage of animals responding also varied with age and treatment. After the combined PMSG+HCG treatment, 90% of the animals ovulated on Day 21, while a similar proportion was not achieved in response to HCG alone until Day 32. The variation in response with age and treatment was related to follicular development within the ovary.

THE DEVELOPMENT OF THE MOUSE OVARY AND ITS RESPONSE TO EXOGENOUS GONADOTROPHINS