1. 1U.S. Department of Agriculture, Agricultural Research Service, U.S. Meat Animal Research Center, Clay Center, Nebraska 68933-0166
2. 2Great Plains Veterinary Educational Center, University of Nebraska Lincoln, Clay Center, Nebraska 68933
3. 3Charm Sciences, Inc., 659 Andover Street, Lawrence, Massachusetts 01843
4. 4College of Veterinary Medicine, Center for Animal Health and Food Safety, University of Minnesota, Minneapolis, Minnesota 55455
5. 5Elanco Animal Health, 2500 Innovation Way, P.O. Box 708, Greenfield, Indiana 46140
6. 6U.S. Department of Agriculture, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA