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
This condition occurs chiefly in cows and mares as a post-parturient accident. The etiology has never been satisfactorily explained. In its early stages it is uncomplicated by any pathological condition of the organ itself. Soon, however, due to impaired circulation, exposure to cold, filth and trauma, complications are almost certain to arise unless the uterus is immediately restored to its normal position.
"Prolapse of the Uterus,"
Iowa State University Veterinarian: Vol. 8
, Article 13.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol8/iss2/13