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 most serious nutritional problem with which southern veterinarians have long had to contend is simply the failure of southern farmers and stockmen to supply enough feed. There is nothing scientific or spectacular about such a conclusion, but the client and his livestock can be benefited far more if he can be made to understand the real cause of his trouble. True, it may sound more impressive to the client to speak of deficiencies of phosphorus, cobalt, iron, copper, or calcium, and there are areas in which they do exist. Fortunately though, nutrition in general has improved materially on southern farms during the past decade.
Groth, A. H.
"Nutrition In The South,"
Iowa State University Veterinarian: Vol. 10
, Article 7.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol10/iss2/7