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
Photosensitization is a major problem in the southern United States and in some foreign countries. It is known to occur in all species of farm animals although in the northern United States it is probably seen most frequently in cattle. Photosensitization is not a major problem in this area of the country, but when encountered should be differentiated from other skin conditions.
"Photosensitization: A Case Report,"
Iowa State University Veterinarian: Vol. 31
, Article 11.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol31/iss3/11