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 Jan. 20,1956, a yearling Hereford steer was admitted to Stange Memorial Clinic with a history of possible foot rot of the two back legs. The animal was posted the next day with the following findings. The two claws of the pelvic limbs were almost completely separated from the limbs at the coffin joint, but were still hanging by the remaining ligaments. The skin of the ears was not affected, but dry gangrene of the posterior one-half of the tail was occurring. Generally ergot poisoning of livestock is of the chronic type with a prolonged course. It arises from repeated ingestion of feed containing ergot.
Iowa State University Veterinarian: Vol. 18
, Article 9.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol18/iss3/9