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
Animal breeding is an old art, which long ago developed far beyond the scientific knowledge of the subject. By actual experience men built up certain rules as to what practices were or were not good procedure for a given set of conditions. Man naturally devised philosophical. explanations which more or less satisfied his intellect as he went along. But it would be a far stretch of the imagination to call these explanations scientific.
Lush, J. L.
"Application Of Genetics,"
Iowa State University Veterinarian: Vol. 7
, Article 6.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol7/iss3/6