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Related Experiment Videos

Reproductive patterns in cyclic and pregnant thyroidectomized mares.

J E Lowe1, R H Foote, B H Baldwin

  • 1Department of Clinical Studies, New York State College of Veterinary Medicine, Ithaca.

Journal of Reproduction and Fertility. Supplement
|January 1, 1987
PubMed
Summary
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Thyroidectomy in mares did not significantly impact reproductive cycles or pregnancy success, despite observable clinical signs like lethargy and edema. Reproductive hormones remained largely unaffected in these horses.

Area of Science:

  • Equine Reproduction
  • Endocrinology
  • Veterinary Science

Background:

  • Thyroid hormones play a crucial role in metabolism and physiological functions in many species.
  • The specific impact of thyroidectomy on equine reproductive performance and hormonal profiles requires further elucidation.

Purpose of the Study:

  • To investigate the effects of thyroidectomy on the reproductive cycles and hormonal status of Quarter horse mares.
  • To assess the pregnancy success rates in thyroidectomized mares compared to intact controls.

Main Methods:

  • Surgical thyroidectomy was performed on three Quarter horse mares; three intact mares served as controls.
  • Reproductive cycles, estrous behavior, and key reproductive hormones (LH, progestagen) were monitored over two breeding seasons.

Related Experiment Videos

  • Pregnancy outcomes were recorded, including insemination with semen from a thyroidectomized stallion.

    • Main Results:

    • Thyroidectomized mares exhibited clinical signs including lethargy, hind limb edema, and coarse hair coats.
    • Estrus duration and length of estrous cycles showed no significant differences between control and thyroidectomized groups.
    • Peak luteinizing hormone (LH) and progestagen levels post-ovulation were comparable between the groups.
    • Pregnancy was achieved in both control and thyroidectomized mares, with no apparent difference in success rates.

    Conclusions:

    • Thyroidectomy in mares does not appear to significantly impair estrous cycle function, hormonal profiles, or pregnancy success.
    • Clinical signs associated with thyroidectomy in mares are not indicative of complete reproductive failure.
    • Further research could explore the long-term effects and potential subclinical impacts of thyroid dysfunction on equine reproduction.