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
Ovine urolithiasis is a relatively common condition occurring both in growing feedlot lambs and in older rams being kept on pasture. Although morbidity is usually low, the condition may affect enough animal sin a flock to become of real economic importance. Early diagnosis of this condition is important since the longer the condition is allowed to persist the less favorable the prognosis becomes.
Jorgensen, James and King, Ronald
"Urolithiasis in Sheep,"
Iowa State University Veterinarian: Vol. 30
, Article 2.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol30/iss2/2