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 toxemia, also known as ovine ketosis, lambing sickness, twin lamb disease, or domzietke, is a widespread, usually fatal disease of sheep. The disease also occurs occasionally in goats, and the clinical course is very similar to that in sheep.
Schulz, Leanne M. and Riese, Richard L.
"Pregnancy Toxemia in the Ewe,"
Iowa State University Veterinarian: Vol. 45
, Article 2.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol45/iss1/2