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 August 31, 1959, a five year old Holstein cow was admitted to Stange Memorial Clinic for treatment. She was part of a show herd and had been referred by the fairgrounds veterinarian at Des Moines, Iowa. History, as given by the owner, revealed that she had difficulty in calving and an unusual fullness in the perianal region was noted.
"Herniation and Anastomosis of the Intestines of a Bovine,"
Iowa State University Veterinarian: Vol. 22
, Article 15.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol22/iss2/15