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 hard tissues, bone, cartilage and teeth, are very sensitive to improper nutrition and react very quickly to even minor variations in the ration. Not only are these reactions distinct but often they appear early in the course of an illness. Frequently they are an indelible imprint of the experience and persist for the entire life of the animal.
Monlux, William S.
"Hard Tissue Lesions Associated with Malnutrition,"
Iowa State University Veterinarian: Vol. 24
, Article 4.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol24/iss2/4