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 July 22, 1941, a three year old purebred Holstein cow had an apparently normal calving. Following parturition, the cow was allowed to drink approximately five gallons of warm water, and for a period of three hours was left unnoticed.
Flickinger, M. R.
"Prolapsed Uterus in a Cow,"
Iowa State University Veterinarian: Vol. 4
, Article 12.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol4/iss2/12