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Most stallions within breeding programmes are expected to breed and compete concurrently. The exercising of stallions with regards to training regimes during the breeding season is a controversial subject. Daily exercise at low intensities is important for the mental and reproductive well-being of the stallion, however higher intensities of exercise, as seen in competing stallions, may have detrimental effects on seminal quality. To calculate if competition does affect semen quality, this study investigated the effect that equestrian discipline and timing of competition had on a range of stallion semen characteristics. This was a retrospective study that evaluated the seminal data of 1130 stallion semen collections from two UK based stud farms between 2009 and 2016. Competing stallion semen quality was significantly lower with regards to concentration ( p &lt; 0.05) and progressive motility ( p &lt; 0.05) than non-competing stallions. Semen volume was higher in competing stallions ( p &lt; 0.05) than non-competing stallions. There was a significant difference in seminal attributes among disciplines and competition levels ( p &lt; 0.05). The difference in semen quality among competing and non-competing stallions, as well as the difference among disciplines suggests endocrinological and physiological changes occur in relation to training intensity and competition.

Variance in Stallion Semen Quality among Equestrian Sporting Disciplines and Competition Levels