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
If a dairy calf reaches one month of age in a strong, vigorous condition, the dairyman has won a major portion of the battle to place the animal in the milking line. Of course, many factors can interfere at a later date, but the calf will be much better able to combat disease, parasites and injuries if it has a reserve of strength to carry it through whatever may affect it. You have all had to give an unfavorable prognosis because the animal in question was in poor general health before the immediate condition developed.
Amstutz, H. E.
Iowa State University Veterinarian: Vol. 14
, Article 6.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol14/iss2/6