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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

Dahmen, J.J.; Hulet, C.V.; Price, D.A.; Everson, D.O. Effects of drylot and pasture management on ovulation rate in sheep: 204-205.Dave, B.K.; Graves, C.N. Enzymes of follicular fluid and effect on sperm: 205.Douglas, R.H.; Ginther, O.J. Effect of PGF2 alpha on estrous cycle and pregnancy in mares: ...

Journal of Animal Science, 1974, 39, pp 135-139

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