Cortisol concentrations in blood and urine of horses.

The research article investigates the levels of cortisol, a stress hormone, in blood and urine samples of thoroughbred and standardbred horses post-racing. It was found that thoroughbred horses have a higher cortisol concentration in urine, and a small proportion of urinary cortisol variation could be attributed to plasma cortisol concentration.

Objective of the Research

• The main objective of this research was to study the cortisol concentrations in the blood and urine samples of thoroughbred and standardbred horses after a race. The researchers aimed to note any significant differences between the two breeds.

Research Methodology and Results

• The researchers collected blood and urine samples from both thoroughbred and standardbred horses after racing.
• Statistical analysis was conducted to compare the cortisol concentrations in the samples from the two breeds.
• The only significant difference found was a higher cortisol concentration in the urine of thoroughbred horses. This may imply that thoroughbred horses experience higher levels of physical stress during racing.
• The volume and pH of the urine did not significantly affect the urinary cortisol concentration. This suggests that the concentration of cortisol in urine is not influenced by these factors.
• Approximately 9.5% of the variation in urinary cortisol could be explained by the influence of plasma cortisol concentration. This indicates that a correlation between the levels of cortisol in blood and urine possibly exists, but it is not particularly strong.
• The results of cortisol and ACTH (adrenocorticotropic hormone) administrations were also observed and compared with the survey results, which would have provided additional insights into stress response in these horse breeds.

Significance of the Research

• This research provides valuable insights into the physical stress experienced by thoroughbred and standardbred horses, revealed through cortisol levels, during racing.
• The results could be useful in determining appropriate measures for stress management in these horses, which could in turn affect their performance and overall well-being.