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Journal of Wildlife Diseases, 28(3), 1992, pp. 494-498
© Wildlife Disease Association  1992
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Freemartinism in a captive herd of Rocky Mountain bighorn sheep (Ovis canadensis)

DE Kenny, RC Cambre, MW Frahm, and TD Bunch


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.




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Copyright © 1992 by the Wildlife Disease Association.