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 rapid development of scientific agriculture in recent years has been due largely to advances in chemical research, especially in the field of biochemistry. The modern chemical techniques have made it possible to make accurate analyses of the essential food nutrients necessary for the economical production of livestock. Consequently, the science of nutrition has made phenomenal advances in the past few years.
Swenson, M. J.
"What a Veterinarian Should Know About Nutrition,"
Iowa State University Veterinarian: Vol. 12
, Article 2.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol12/iss3/2