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 October 20, 1955 a 3-year-old Hereford bull was admitted to Stange Memorial Clinic with a scrotal swelling that had recently developed. The animal was not eating.
Lyon, Donald G.
"Scrotal Hernia in a Bull,"
Iowa State University Veterinarian: Vol. 18
, Article 6.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol18/iss1/6