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
Pregnancy disease may be defined as a toxemia of advanced pregnancy characterized by paralysis and convulsions, a high mortality, extreme fatty degeneration of the liver and an extreme ketonuria.
Moore, Donald E.
"Pregnancy Disease In Ewes,"
Iowa State University Veterinarian: Vol. 7
, Article 7.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol7/iss4/7