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 clinical use of hormones for the augmentation of fertility in the female is of practical importance. To the Livestock breeder, the value of his stock is measured by the production of offspring. It is essential that the veterinarian have an understanding of the complex hormonal control of the estrus cycle. This knowledge is necessary to understand possible variations in length and activities of the cycle and aids in the therapeutic use of hormone products.
Filkins, Mylon E.
"Some Clinical Uses of Hormones in the Cow,"
Iowa State University Veterinarian: Vol. 26
, Article 7.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol26/iss4/7