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.
Highlights
INTRODUCTIONIn 2014, eleven horses were culled for different reasons, namely chronic diseases, behavioural abnormalities, or high inbreeding factors
The horse was kept in a separate place for two years with 12 mares in its harem group; none of the mares covered got pregnant
We classify the case as a mosaic Klinefelter syndrome, the first reported case in Przewalski’s horse
Summary
In 2014, eleven horses were culled for different reasons, namely chronic diseases, behavioural abnormalities, or high inbreeding factors. One of those horses, the stallion ‘Gagarin’, was known to be infertile with no sperm cells in his semen taken by electroejaculator (Christine Gohl, personal communication, 2011). The stallion ‘Gagarin’ was born in Munich as a descendent of the highly inbred A-line Fertility problems in both sexes are frequent in this line. The horse arrived in Hortobagy in 2012 It was kept in a separate place for two years with 12 mares in his harem group (six mares had foals earlier); none of the mares covered got pregnant. To detect the cause of its infertility, andrological and cytogenetic investigations have been conducted
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