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 herd of feedlot cattle being fattened for slaughter suddenly sicken and many die. Many exhibit convulsive seizures and other signs of illness. Investigation reveals that read feed has accidentally been contaminated with an insecticide.
Buck, William B. and Herrick, John B.
"Quality of Life: The Veterinarians Contribution,"
Iowa State University Veterinarian: Vol. 32
, Article 8.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol32/iss3/8