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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1 July 1992
Freemartinism in a Captive Herd of Rocky Mountain Bighorn Sheep (Ovis canadensis)
David E. Kenny,
Richard C. Cambre,
Michelle W. Frahm,
Thomas D. Bunch
Journal of Wildlife Diseases
Vol. 28 • No. 3
July 1992
Vol. 28 • No. 3
July 1992
chimera
freemartin
H-Y antigen
intersex
Ovis canadensis
Rocky Mountain bighorn sheep