Peer-reviewed veterinary case report
Stallion infertility due to sperm head defects - what to know
By Held, J P et al.·Published in Journal of the American Veterinary Medical Association·1991·Department of Rural Practice·View original on PubMed →
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Original publication title: Spermatozoal head defect as a cause of infertility in a stallion.
- Species:
- horse
Plain-English summary
A 9-year-old Arabian stallion was brought in for infertility issues that had persisted for three years. The veterinarian found that both of his testes were small and there was some fluid present around them. A semen analysis showed that only 10% of the sperm were moving properly, and a staggering 92% of the sperm had abnormalities, mainly defects in their heads. Unfortunately, this stallion's fertility issues were linked to these sperm defects, which could hinder successful breeding.
People also search for: stallion infertility causes · abnormal sperm in horses · breeding soundness evaluation stallion
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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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/1813470/