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Related Experiment Videos

Plasma melatonin in ewes after ovariectomy.

J Arendt, C A Laud, A M Symons

    Journal of Reproduction and Fertility
    |May 1, 1983
    PubMed
    Summary

    Ovariectomized ewes showed higher melatonin levels than controls, indicating gonads inhibit melatonin secretion. This study explores the relationship between reproductive organs and hormone production in sheep.

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    Area of Science:

    • Reproductive Endocrinology
    • Animal Physiology

    Background:

    • Melatonin secretion is influenced by photoperiod and reproductive status.
    • The role of gonads in regulating melatonin in ewes requires further elucidation.

    Purpose of the Study:

    • To investigate the influence of ovariectomy on plasma melatonin concentrations in ewes.
    • To determine if gonads exert an inhibitory effect on melatonin secretion.

    Main Methods:

    • Ovariectomy was performed on six ewes, with five intact ewes serving as controls.
    • Luteinizing hormone (LH) levels were monitored weekly.
    • Plasma melatonin was measured at 3-hour intervals over 24 hours on Days 16 and 58 post-ovariectomy.

    Main Results:

    • Plasma melatonin concentrations were significantly higher in ovariectomized ewes compared to controls.
    • On Day 16, total 24-hour melatonin secretion was nearly threefold greater in ovariectomized ewes.
    • LH levels were monitored but not detailed in the provided abstract.

    Conclusions:

    • The results suggest that gonads exert an inhibitory influence on melatonin secretion in ewes.
    • This finding contributes to understanding the interplay between the reproductive system and the pineal gland in sheep.

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