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 veterinarian's role in the food animal industry has changed significantly in the lat few years. Instead of treating sick animals on an individual basis, he is called upon to establish herd health programs and consult with swinemen on their problems no matter what phase of their hog management is involved. With the trend toward confinement hog rearing, veterinarians in the Midwest are sometimes perplexed by the rapidity with which the industry is changing.
Christenson, Charles L.
"What a Veterinarian Should Know About Swine Confinement,"
Iowa State University Veterinarian: Vol. 35
, Article 9.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol35/iss2/9