Spermatozoal head defect as a cause of infertility in a stallion. |
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Authors: | J P Held P Prater M Stettler |
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Institution: | Department of Rural Practice, College of Veterinary Medicine, University of Tennessee, Knoxville 37901. |
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Abstract: | A 9-year-old Arabian stallion with a 3-year history of infertility was evaluated for breeding soundness. Both testes were small. Ultrasonography revealed a small amount of free fluid between the tunics of both testes. Results of cytologic examination of the fluid were unremarkable. On semen examination, progressive motility was 10%, and total number of spermatozoa in the ejaculate was 6.6 x 10(9), of which 92% were abnormal. Predominant abnormalities were head defects (75%): 57% of the heads had single or multiple vacuoles, and 60% also had midpiece swelling or bending. |
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