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 general, the body needs daily intakes of a proper proportion of carbohydrate and fat for energy, amino acids for the synthesis of tissue proteins, and vitamins for special structures. In addition, it requires inorganic ions and water for the ionic environment, and inorganic ,elements such as iron, cobalt, manganese and copper, for organic combination. Thus, if dietary therapy emphasizes only one or two, or anything less than the whole group of ingredients needed daily, then the clinician is depending upon the body reserves to correct the deficiency. Similarly, a study of any particular ingredient such as the protein component must be done with a diet which supplies, to the best of our knowledge, all other essential ingredients.
Edds, G. T.
"Small Animal Nutrition,"
Iowa State University Veterinarian: Vol. 21
, Article 7.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol21/iss3/7