title: Freemartinism in a captive herd of Rocky Mountain bighorn sheep (Ovis canadensis).
abstract: Freemartinism in two animals from a captive herd of Rocky Mountain bighorn sheep (Ovis canadensis) at the Denver Zoological Gardens (Denver, Colorado, USA) is described. A young ewe had female external genitalia, a masculine appearance, and demonstrated male behavior as she matured. Another ewe with female external genitalia died as a yearling. Necropsy revealed a non-patent vagina and internal male genitalia. Both females were chimeric with karyotypes containing XX and XY sex chromosomes.
authors.affiliation: Denver Zoological Gardens, City Park, Colorado 80205.
authors.forename: D E
authors.initials: DE
authors.lastname: Kenny
authors.forename: R C
authors.initials: RC
authors.lastname: Cambre
authors.forename: M W
authors.initials: MW
authors.lastname: Frahm
authors.forename: T D
authors.initials: TD
authors.lastname: Bunch
mesh_terms: D000818:Animals; D000836:Animals, Zoo; D002678:Chimera; D005260:Female; D005611:Freemartinism / Q000235:genetics / Q000473:pathology*; D007621:Karyotyping / Q000662:veterinary; D008297:Male; D012730:Sex Chromosomes; D012756:Sheep; D012757:Sheep Diseases / Q000235:genetics / Q000473:pathology*