Cortisol concentrations in blood and urine of horses

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Abstract
A survey of the concentrations of cortisol in blood and urine samples taken from thoroughbred and standardbred horses after racing is presented. Statistical analysis showed the only significant difference between thoroughbred and standardbred horses was a higher cortisol concentration in thoroughbred urine. Urine volume and pH had no significant influence on the urinary cortisol concentration, however 9.5% of the urinary cortisol variation could be explained due to the influence of plasma cortisol concentration. The results of cortisol and ACTH administrations are also shown and compared with the survey results.