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Selected laboratory parameters of thoroughbreds

J Van Heerden1, J Dauth, M J Dreyer

  • 1Department of Companion Animal Medicine and Surgery, Faculty of Veterinary Science, Medical University of Southern Africa, Republic of South Africa.

Journal of the South African Veterinary Association
|December 1, 1990
PubMed
Summary

This study analyzed blood variables in training Thoroughbreds, finding most values within normal ranges. Significant differences in hematocrit were observed between sexes and temperaments, but not performance or age.

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Area of Science:

  • Equine Sports Medicine
  • Veterinary Clinical Pathology
  • Thoroughbred Horse Physiology

Background:

  • Understanding normal physiological parameters is crucial for assessing the health of athletic horses.
  • Training regimens can influence various blood parameters in horses.
  • Establishing reference ranges for key variables aids in early detection of health issues.

Purpose of the Study:

  • To establish reference ranges for selected haematological, blood chemical, and serological variables in healthy Thoroughbreds in training.
  • To investigate potential differences in these variables based on performance, age, sex, and temperament.
  • To assess the prevalence of babesiosis carriers and their laboratory findings.

Main Methods:

  • Collected blood samples from 45 healthy Thoroughbreds in training.

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  • Analyzed a comprehensive panel of haematological (e.g., haemoglobin, haematocrit, cell counts) and serum biochemical variables (e.g., electrolytes, proteins, enzymes, minerals).
  • Measured hormone concentrations (cortisol, insulin, parathormone, aldosterone, folate, Vitamin B12) and blood lead levels. Screened for babesiosis.

    • Main Results:

    • Most measured haematological and serum biochemical variables were within previously reported normal ranges for horses.
    • No significant differences in haematocrit were found between horses of different performance levels or age groups.
    • Significant differences in haematocrit were observed between sexes (males vs. females) and temperaments (quiet vs. excitable).
    • Hormone and Vitamin B12 concentrations varied within established ranges, and blood lead levels were below the detection limit.
    • 33.3% of horses were carriers of babesiosis, with no significant laboratory differences compared to non-carriers.

    Conclusions:

    • The study provides valuable reference data for haematological and biochemical parameters in training Thoroughbreds.
    • Sex and temperament appear to influence haematocrit levels in these horses.
    • The prevalence of babesiosis carriers did not impact the measured laboratory variables in this cohort.