/ Holstein Content for ºÙºÙÊÓƵ en /news/genetic-mutation-1-bull-caused-loss-half-million-calves-worldwide <p>Pawnee Farm Arlinda Chief was one of the most prolific bulls in the history of Holstein cattle breeding — but he also introduced a lethal gene into the population, responsible for an estimated half million spontaneous abortions worldwide. Now researchers at ºÙºÙÊÓƵ and the University of Illinois&nbsp;Urbana-Champaign&nbsp;have identified the mutation responsible, enabling ranchers to test for and avoid it.&nbsp;</p> October 13, 2016 - 9:34am Andy Fell /news/genetic-mutation-1-bull-caused-loss-half-million-calves-worldwide