Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
On Oct. 17, 1943, a five year old, black and white spotted horse entered the Stange Memorial Clinic. The owner had previously written the clinic concerning the patient, giving a history which suggested nymphomania. The patient was observed for several days, but no symptoms of true nymphomania were exhibited. Instead, the horse showed symptoms of sexual desire resembling a stallion. Rectal palpation revealed rudimentary development of the uterus and vagina, the anterior poles of the uterine cornuae being terminated in pendant, cord-like structures of such length that the ovaries could not be palpated. A tentative diagnosis of gynandromorphia was made. After consulting the owner, it was decided to submit the horse to surgery.
Peterson, Philip C.
"A Case of Gynandromorphism in the Equine,"
Iowa State University Veterinarian: Vol. 6
, Article 12.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol6/iss2/12