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 Hampshire ewe was brought to the Iowa State College Veterinary Clinic on Feb. 17, 1941. The normal gestation period was almost completed. The ewe had become lame about ten days prior to the time she was presented. The only external cause the owner was aware of which could possibly be a factor in the case was the fact that the ewe had to jump over a ten inch door sill to get into the stable.
Huso, B. T.
"Rupture of the Prepubic Tendon of a Ewe,"
Iowa State University Veterinarian: Vol. 3
, Article 17.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol3/iss3/17