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
A two year old mare of mixed breeding was presented for an examination of her genital system. The owner reported that the mare had undergone a gradual change of disposition with the onset of puberty. She had begun to tease other mares and would mount those in estrus. After mounting, she would often kick the other mare. At the time of presentation her signalment resembled that of a stallion.
"A Case Report: Equine Pseudohermaphroditism,"
Iowa State University Veterinarian: Vol. 27
, Article 7.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol27/iss3/7