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Equine thyroid function tests: a preliminary investigation.

P Harris1, D Marlin, J Gray

  • 1Animal Health Trust, Newmarket, Suffolk.

The British Veterinary Journal
|January 1, 1992
PubMed
Summary
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Thyroid stimulating hormone (TSH) and thyrotrophin releasing hormone (TRH) significantly increase thyroxine (T4) levels in horses. However, some horses, particularly those with equine rhabdomyolysis syndrome (ERS), may show a reduced response to TRH.

Area of Science:

  • Veterinary Endocrinology
  • Equine Physiology

Background:

  • Thyroxine (T4) is a crucial thyroid hormone regulating metabolism in horses.
  • Thyroid stimulating hormone (TSH) and thyrotrophin releasing hormone (TRH) are key regulators of T4 production.

Purpose of the Study:

  • To investigate the effects of TSH and TRH on plasma T4 concentrations in horses.
  • To assess potential differences in T4 response based on physiological status and workload.
  • To explore the T4 response in horses with suspected equine rhabdomyolysis syndrome (ERS).

Main Methods:

  • Intravenous administration of TSH and TRH to clinically normal Thoroughbred horses and ponies.
  • Measurement of plasma T4 concentrations at various time points post-administration.
  • Comparison of T4 responses between different groups (e.g., working vs. resting horses, ponies, pregnant mares).

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Main Results:

  • Both TSH and TRH administration resulted in significant increases in plasma T4 concentrations in normal horses and ponies.
  • Peak T4 response typically occurred 3-4 hours after hormone administration.
  • Thoroughbreds in full work showed a significantly different T4 response to TRH compared to resting Thoroughbreds.
  • Some ponies and a pregnant mare exhibited reduced T4 responses to TSH or TRH.
  • Horses with ERS did not show significantly different resting T4 levels, but some may have a blunted TRH response.

Conclusions:

  • TSH and TRH are effective in stimulating T4 release in horses.
  • Factors such as workload and physiological state can influence the T4 response to TRH.
  • A diminished T4 response to TRH may be observed in some horses with ERS, warranting further investigation.