Management Options for the Aged Breeding Stallion with Declining Testicular Function |
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Authors: | Terry L Blanchard Dickson D Varner Charles C Love Steven P Brinsko James P Morehead |
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Institution: | 1. Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX;2. Equine Medical Associates, PSC, Lexington, KY |
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Abstract: | 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 until the stallion eventually becomes so subfertile that it is no longer commercially feasible to continue breeding. However, more intensive breeding management can sometimes result in pregnancy rates (per cycle and per season) that are sufficient to justify breeding of the aged stallion to a diminishing number of mares during the period of declining fertility. |
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Keywords: | Stallion Aged Subfertility Testicular dysfunction |
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