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In our experience, the testicular dysfunction that develops in aged stallions is typically progressive, contributing to a gradual deterioration in sperm output and quality over 2-4 years. As the ability to produce sufficient numbers of normal sperm in ejaculates declines, so do pregnancy rates...

Blanchard, T. L.; Varner, D. D.; Love, C. C.; Brinsko, S. P.; Morehead, J. P.
Elsevier, New York, USA
Journal of Equine Veterinary Science, 2012, 32, 8, pp 430-435