Induction of ovulation by exogenous gonadotrophin during pseudopregnancy, pregnancy or lactation in rats

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Abstract
In pseudopregnancy the ovarian follicles were highly responsive to exogenous gonadotropin: HCG [human chorionic gonadotropin] induced ovulation on any day of pseudopregnancy and, apart from Day 1, the numbers of eggs ovulated were high. Follicles were able to respond to HCG throughout pregnancy, but fewer follicles ovulated as the pregnancy progressed until Day 18. A significant increase in the number of ova was noted from Day 18-19 (P < 0.01) and from Day 19-20 (P < 0.01). This increased response is clearly related to the development of follicles for the post-partum estrus. HCG can induce ovulation on any day of pregnancy, but the number of eggs ovulated by each rat was low from Day 12-18. In lactating rats, no ovulatory response was noted from Day 2-7. The ovulatory response was variable after Day 8, suggesting that the stimulus for the initiation of follicular maturation varied because of differences in suckling activity.

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