Andrological And Cytogenetic Investigations Of An Infertile Przewalski'S Stallion

ACTA VETERINARIA HUNGARICA(2021)

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Abstract
The case of an 8-year-old, sexually active but infertile Przewalski's stallion (Equus ferus przewalskii) was studied. Besides the infertility, the stallion also showed permanent problems with its body condition, being obviously weaker than all the other group members. The horse was kept in a separate place for two years with 12 mares in its harem group (six mares had foals earlier); however, none of the mares covered got pregnant. Andrological and cytogenetic investigations revealed underdeveloped testes, arrested spermatogenesis, azoospermia, and XY/XXY/X0 mosaicism. We classify the case as a mosaic Klinefelter syndrome, the first reported case in Przewalski's horse.
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Key words
Przewalski's horse, infertility, Klinefelter syndrome, mosaicism
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