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
In the past several years, there has been a significant increase in the number of avian patients presenting to small animal clinics and veterinary teaching hospitals. Many of these birds require surgery and many more will benefit 'from the use of chemical restraint to avoid undue stress during certain procedures.
Doolen, M. D. and Jackson, L.
"Anesthesia in Caged Birds,"
Iowa State University Veterinarian: Vol. 53
, Article 5.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol53/iss2/5