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
Abortion, according to S.J. Roberts, DVM, MS, is the expulsion of a living fetus before it reaches a viable age, or more commonly the expulsion of a dead fetus of a recognizable size at any stage of gestation. This unproductive termination of pregnancy is costly to the cattle producer and presents an enormous diagnostic task for the veterinarian in each field. A complete understanding of each cause of abortion and assistance from a diagnostic laboratory will enhance the efforts of the diagnostician in the field.
Iowa State University Veterinarian: Vol. 36
, Article 9.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol36/iss2/9