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Related Experiment Videos

Melatonin rhythms in Pony mares and foals

D M Kilmer, D C Sharp, L A Berglund

    Journal of Reproduction and Fertility. Supplement
    |January 1, 1982
    PubMed
    Summary

    Melatonin secretion in mares follows a day-night pattern, influenced by the superior cervical ganglia. This rhythm changes with altered light exposure and develops in foals over time.

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    Area of Science:

    • Animal Physiology
    • Endocrinology
    • Chronobiology

    Background:

    • Melatonin, a hormone regulating circadian rhythms, is produced by the pineal gland.
    • Its secretion is influenced by light-dark cycles and neural pathways.

    Purpose of the Study:

    • To investigate the role of the superior cervical ganglia in melatonin secretion patterns in mares.
    • To examine the effects of altered photoperiods on melatonin rhythms.
    • To assess the development of melatonin rhythms in foals.

    Main Methods:

    • Surgical removal of superior cervical ganglia in mares.
    • Exposure of mares to different photoperiods (10L:14D and 0L:24D).
    • Monitoring melatonin concentrations in mares and foals under natural lighting conditions.

    Main Results:

    • Intact mares showed higher night-time melatonin levels, which were absent after superior cervical ganglia removal.
    • Mares exposed to continuous darkness exhibited altered, uncoordinated melatonin rhythms.
    • Mares displayed significant melatonin trends earlier than their foals, with foals showing trends by 7-11 weeks of age.

    Conclusions:

    • The superior cervical ganglia are crucial for the day-night melatonin rhythm in mares.
    • Photoperiod manipulation disrupts coordinated melatonin secretion.
    • Melatonin rhythm regulation matures gradually in foals.

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