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Related Experiment Videos

Ovulation blockade and receptivity in the cyclic rat.

A van Riemsdijk, G H Zeilmaker

    Acta Endocrinologica
    |April 1, 1979
    PubMed
    Summary

    Exposure to male rats can induce early sexual receptivity in female rats. Hormones from pre-ovulatory follicles, not progesterone, likely regulate this receptivity and its duration, even when ovulation is blocked.

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    Area of Science:

    • Reproductive Biology
    • Endocrinology
    • Animal Behavior

    Background:

    • Sexual receptivity in female rats is tightly linked to the ovulatory cycle.
    • Understanding the hormonal regulation of estrus and ovulation is crucial for reproductive studies.

    Purpose of the Study:

    • To investigate the factors influencing the onset and termination of sexual receptivity in rats.
    • To determine the role of ovulation and associated hormonal changes in regulating estrus duration.

    Main Methods:

    • Studied sexual receptivity in intact cyclic rats and rats with ovulation inhibited by nembutal.
    • Administered nembutal at specific times to block ovulation and observed receptivity.
    • Investigated the effect of progesterone administration on receptivity.
    • Examined the induction of reflex ovulation in blocked rats.

    Main Results:

    • Early sexual receptivity could be induced by male exposure prior to the critical ovulation period.
    • Ovulation inhibition with nembutal prolonged the period of sexual receptivity by 24 hours.
    • Progesterone administration did not attenuate receptivity.
    • Reflex ovulation could be induced without intromission, suggesting limited female genital role.

    Conclusions:

    • LH-surge dependent progesterone secretion is not essential for estrus induction or termination.
    • Hormones, likely estrogens from pre-ovulatory follicles, are responsible for prolonged receptivity when ovulation is blocked.

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