Peer-reviewed veterinary case report
Semen characteristics in a sub-fertile Arabian stallion with idiopathic teratospermia.
- Journal:
- Reproduction in domestic animals = Zuchthygiene
- Year:
- 2010
- Authors:
- Brito, L F C et al.
- Affiliation:
- Department of Clinical Studies New Bolton Center · United States
- Species:
- horse
Plain-English summary
A 5-year-old Arabian stallion was being used for breeding over an 8-month period, but he had a low pregnancy rate of only 26.3% per cycle. Although he was healthy and his reproductive organs looked normal, tests showed that while he produced a normal amount of sperm, the quality was very poor. Most of the sperm had serious defects, including unusual shapes and sizes, with many showing multiple problems. The researchers concluded that there was no clear reason for these issues, suggesting that the stallion likely had a genetic problem affecting his sperm development.
Abstract
A 5-year-old Arabian stallion was managed for breeding with fresh/extended semen during a period of 8 months with a resulting per cycle pregnancy rate of 26.3%. The stallion was in good health and no abnormalities of the reproductive tract were observed. Evaluation of several ejaculates revealed that sperm production and semen quality were mostly unchanged during the period of evaluation, that sperm production was normal and that semen quality was extremely poor. The most prevalent sperm defects were abnormal heads and mid-pieces. Most abnormal heads were microcephalic and/or tapered and considerable variation in sperm head dimensions within and among ejaculates was observed. A unique defect characterized by swollen/roughened mid-piece caused by accumulation of cytoplasmic-like material and abnormal mitochondrial sheath was observed. Nuclear vacuoles, acrosome defects, and teratoids were also prevalent and most sperm presented multiple abnormalities. The absence of any clear cause or any signs of testicular degeneration, combined with normal sperm production, and constant abnormal sperm production suggest an inherent, congenital disturbance of spermatogenesis as the cause of teratospermia in this case.
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Search related cases →Original publication: https://pubmed.ncbi.nlm.nih.gov/19144036/