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Related Experiment Videos

Episodic LH secretion patterns in the mare during the oestrous cycle.

J W Evans, J P Hughes, D P Neely

    Journal of Reproduction and Fertility. Supplement
    |January 1, 1979
    PubMed
    Summary

    Luteinizing hormone (LH) release in mares shows episodic patterns during specific reproductive phases. These patterns are linked to ovulation but can also occur independently, influencing reproductive events.

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    Area of Science:

    • Veterinary Endocrinology
    • Reproductive Physiology

    Background:

    • Luteinizing hormone (LH) plays a critical role in equine reproduction, particularly in ovulation.
    • Understanding the precise patterns of LH secretion is crucial for managing reproductive cycles in mares.

    Purpose of the Study:

    • To investigate the episodic release patterns of plasma LH in mares throughout the oestrous cycle.
    • To correlate LH secretory patterns with ovulation events, including single, multiple, and luteal-phase ovulations.

    Main Methods:

    • Jugular blood samples collected from mares at frequent (5-20 min) and daily intervals over 2-5 days.
    • Plasma LH concentrations determined using radioimmunoassay during various oestrous cycle phases.

    Main Results:

    Related Experiment Videos

  • Episodic LH release observed in some mares during the ovulatory period and dioestrus.
  • Fluctuations in LH concentration occurred before ovulation, sometimes without distinct episodic bursts.
  • Dioestrous ovulations were associated with small LH increases, but similar increases did not always lead to ovulation.
  • No significant differences in LH secretory patterns were found between single and multiple ovulations.

    • Conclusions:

    • LH secretion in mares exhibits complex episodic patterns during the oestrous cycle, particularly around ovulation and during dioestrus.
    • LH surges are not the sole indicator of ovulation, as LH increases can occur without ovulation, and ovulation can occur at low LH concentrations.