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Thyroid function and pregnancy status in broodmares.

Travis B Meredith1, Ina Dobrinski

  • 1Section of Reproduction, Department of Clinical Studies, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348, USA.

Journal of the American Veterinary Medical Association
|April 9, 2004
PubMed
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Thyroid function in broodmares does not appear to be linked to pregnancy success. Poor thyroid function is unlikely to be a common cause of infertility in horses, making thyroid hormone treatment questionable.

Area of Science:

  • Equine reproduction
  • Endocrinology
  • Veterinary medicine

Background:

  • Thyroid hormones play a crucial role in metabolism and reproductive function.
  • Assessing thyroid function is important for understanding reproductive health in broodmares.

Purpose of the Study:

  • To investigate the relationship between thyroid function and pregnancy status in broodmares.
  • To determine if thyroid dysfunction is a significant factor in equine infertility.

Main Methods:

  • A prospective study involving 79 Thoroughbred and Standardbred broodmares.
  • Serum triiodothyronine (T3) and thyroxine (T4) concentrations were measured before and after thyrotropin-releasing hormone (TRH) stimulation.
  • Pregnancy status was monitored via transrectal ultrasonography.

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Main Results:

  • Thyroid hormone levels varied widely but responded to TRH stimulation in most mares.
  • No significant differences in baseline or stimulated thyroid hormone concentrations were observed between pregnant and non-pregnant mares.
  • The overall pregnancy rate was 76%.

Conclusions:

  • Decreased thyroid function appears uncommon in broodmares.
  • Poor thyroid function is not identified as a frequent cause of infertility in this population.
  • Routine thyroid hormone supplementation to enhance fertility in broodmares is not supported by these findings.