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
The killing of animals is perhaps the most consistent task faced by veterinarians in all facets of the profession. In private or institutionalized practice, in almost any area of active research, in meat inspection, and in pathology and diagnostic services, one common shared activity is the actual or supervisory killing of animals. The motivations, methods, and considerations are myriad, but the process of inflicting death on a variety of living creatures is an inseparable, undeniable part of the veterinary profession.
Schwink, Kay and Egger, E. L.
"Methods of Euthanasia,"
Iowa State University Veterinarian: Vol. 42
, Article 8.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol42/iss2/8