{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,10]],"date-time":"2026-06-10T05:10:36Z","timestamp":1781068236927,"version":"3.54.1"},"reference-count":42,"publisher":"Akademiai Kiado Zrt.","issue":"2","license":[{"start":{"date-parts":[[2021,7,31]],"date-time":"2021-07-31T00:00:00Z","timestamp":1627689600000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["akjournals.com"],"crossmark-restriction":true},"short-container-title":["AVet"],"published-print":{"date-parts":[[2021,7,31]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The case of an 8-year-old, sexually active but infertile Przewalski\u2019s stallion (<jats:italic>Equus ferus przewalskii<\/jats:italic>) 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\u2019s horse.<\/jats:p>","DOI":"10.1556\/004.2021.00027","type":"journal-article","created":{"date-parts":[[2021,7,22]],"date-time":"2021-07-22T13:21:14Z","timestamp":1626960074000},"page":"189-193","update-policy":"https:\/\/doi.org\/10.1556\/policypage.crossmark.crossref.1","source":"Crossref","is-referenced-by-count":1,"title":["Andrological and cytogenetic investigations of an infertile Przewalski\u2019s stallion"],"prefix":"10.1556","volume":"69","author":[{"given":"Gabriella","family":"K\u00fatv\u00f6lgyi","sequence":"first","affiliation":[{"name":"1Department of Precision Livestock Farming and Animal Biotechnics, Institute of Animal Sciences, Hungarian University of Agriculture and Life Sciences, Kaposv\u00e1r Campus, Guba S\u00e1ndor u. 40, H-7400 Kaposv\u00e1r, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristin","family":"Brabender","sequence":"additional","affiliation":[{"name":"2Hortob\u00e1gy National Park, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Magnus","family":"Andersson","sequence":"additional","affiliation":[{"name":"3Department of Production Animal Medicine, University of Helsinki, Helsinki, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ariuntungalag","family":"Javkhlan","sequence":"additional","affiliation":[{"name":"4Department of Precision Livestock Farming and Animal Biotechnics, Institute of Animal Sciences, Hungarian University of Agriculture and Life Sciences, Georgikon Campus, Keszthely, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Szabolcs","family":"Nagy","sequence":"additional","affiliation":[{"name":"4Department of Precision Livestock Farming and Animal Biotechnics, Institute of Animal Sciences, Hungarian University of Agriculture and Life Sciences, Georgikon Campus, Keszthely, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tam\u00e1s","family":"P\u00e1ble","sequence":"additional","affiliation":[{"name":"5Vitafort Co. Ltd., Dabas, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Istv\u00e1n","family":"Egerszegi","sequence":"additional","affiliation":[{"name":"6Department of Precision Livestock Farming and Animal Biotechnics, Institute of Animal Sciences, Hungarian University of Agriculture and Life Sciences, G\u00f6d\u00f6ll\u0151 Campus, G\u00f6d\u00f6ll\u0151, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andr\u00e1s","family":"Hidas","sequence":"additional","affiliation":[{"name":"6Department of Precision Livestock Farming and Animal Biotechnics, Institute of Animal Sciences, Hungarian University of Agriculture and Life Sciences, G\u00f6d\u00f6ll\u0151 Campus, G\u00f6d\u00f6ll\u0151, Hungary"},{"name":"7Research Centre for Farm Animal Gene Conservation, National Centre for Biodiversity and Gene Conservation, G\u00f6d\u00f6ll\u0151, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Istv\u00e1n","family":"So\u00f3s","sequence":"additional","affiliation":[{"name":"8Al-Rakib Co. Ltd., Debrecen, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andr\u00e1s","family":"Kov\u00e1cs","sequence":"additional","affiliation":[{"name":"9Faculty of Agriculture and Food Sciences and Environmental Management, University of Debrecen, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"425","reference":[{"key":"ref11","doi-asserted-by":"crossref","first-page":"713","DOI":"10.1111\/j.1699-0463.1944.tb04971.x","article-title":"On the occurrence in bull sperm of certain \u2018Medusa formations\u2019 derived from the epithelium of the efferent ducts of the testis","volume":"21","author":"Blom","year":"1944","journal-title":"Acta Pathol. Microbiol. Scand."},{"key":"ref111","first-page":"71","article-title":"Chromosome studies in Przewalski horses (Equus przewalskii)","volume-title":"Genetics and Hereditary Diseases of the Przewalski Horse. 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Dairy Sci."},{"key":"ref71","first-page":"627","article-title":"Detection by G- and C-band karyotyping of gonosome anomalies in horses of different breeds","volume":"32","author":"Halnan","year":"1982","journal-title":"J. Reprod. Fert."},{"key":"ref361","doi-asserted-by":"crossref","first-page":"91","DOI":"10.1016\/j.cryobiol.2013.12.009","article-title":"Cryopreservation of epididymal stallion sperm","volume":"68","author":"Olaciregui","year":"2014","journal-title":"Cryobiology"},{"key":"ref411","first-page":"207","article-title":"A Przewalski\u2019s horse population in a Unique European Steppe Reserve \u2013 the Hortob\u00e1gy National Park in Hungary","volume":"2009","author":"Zimmermann","year":"2009","journal-title":"Equus, Zoo Praha"},{"key":"ref271","doi-asserted-by":"crossref","first-page":"522","DOI":"10.1016\/S0007-1935(17)48137-1","article-title":"A case of intersexuality in the horse with type 2A+XXXY chromosome formula","volume":"126","author":"Gluchovschi","year":"1970","journal-title":"British Vet. J."},{"key":"ref131","doi-asserted-by":"crossref","first-page":"197","DOI":"10.1016\/j.anireprosci.2011.08.002","article-title":"Cryopreservation and fertility of ejaculated and epididymal stallion sperm","volume":"127","author":"Monteiro","year":"2011","journal-title":"Anim. Reprod. Sci."},{"key":"ref121","doi-asserted-by":"crossref","first-page":"358","DOI":"10.2746\/042516400777032138","article-title":"Two sterile stallions with XXY-syndrome","volume":"32","author":"M\u00e4kinen","year":"2000","journal-title":"Equine Vet. J."},{"key":"ref181","doi-asserted-by":"crossref","first-page":"239","DOI":"10.1016\/j.beem.2010.09.006","article-title":"Klinefelter syndrome","volume":"25","author":"Wikstr\u00f6m","year":"2011","journal-title":"Best Pract. Res. Clin. Endocrinol. Metab."},{"key":"ref231","doi-asserted-by":"crossref","first-page":"150","DOI":"10.1111\/j.2042-3306.1972.tb03898.x","article-title":"An intersex (male pseudohermaphrodite) horse with 64XX\/65XXY mosaicism","volume":"3","author":"Bouters","year":"1972","journal-title":"Equine Vet. J."},{"key":"ref21","doi-asserted-by":"crossref","first-page":"150","DOI":"10.1111\/j.2042-3306.1972.tb03898.x","article-title":"An intersex (male pseudohermaphrodite) horse with 64XX\/65XXY mosaicism","volume":"3","author":"Bouters","year":"1972","journal-title":"Equine Vet. 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