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Seminal volume, concentration and progressive motility were analysed for differences between competing and non-competing stallions, then for differences between stallion disciplines.Results: Competing stallion semen concentration and progressive motility was significantly lower than noncompeting stallions (p) and the date in which the semen sample had been collected.
Exercise plasma testosterone concentrations were increased, but progressive motility was negatively affected by the intensity of the exercise performed .A Kruskal-Wallis test of difference was used to determine if a difference existed in semen parameters between the stallion’s level of competition. Semen volume increased significantly between non-competing and competing stallions, and significantly increased with competition level (p=0.000).A Kruskal-Wallis test was used to identify if any differences occurred between stallion ages and breeds and semen quality. Research carried out with human participants supports the present findings, stating that physical activity has a significant positive effect on seminological attributes including seminal volume, suggesting the outcome is due to the favourable homeostatic balanced of LH and testosterone [16,24].This may be a reason behind the increases in competing stallions due to the collection process differences between the two stud farms, with only one farm using a teaser mare.
More concerningly, the mean seminal volumes of both competing and noncompeting stallions were below that of the AI referencing ranges (60-120 ml).
Stallions were categorised based on whether they were competing or non-competing and further by ages.