1 USDA-APHIS-VS, Fort Collins, CO 80526-8117, USA.
2 Cargill Animal Nutrition, Brookville, OH, 45309, USA.
3 SCCL, Saskatoon, Saskatchewan, Canada57K 6A2.
4 Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523-1678, USA.
5 Land O'Lakes Animal Milk Solutions, Cottage Grove, WI 53527, USA.
6 Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA.
7 Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St. Paul, MN 55108, USA.
8 School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706, USA.
9 Department of Population Health and Pathobiology, North Carolina State University, Raleigh, NC 27607, USA.
10 Strauss Feeds, Watertown, WI 53908, USA.
11 Department of Animal Science, The Pennsylvania State University, University Park, PA 16802, USA.
12 Down Home Heifer Solutions, Blacksburg, VA 24060, USA.
13 School of Veterinary Medicine, University of California-Davis, Davis, CA 95616, USA.
14 Sterner Veterinary Clinic P.C., Ionia, MI 48846, USA.
15 Wisconsin Veterinary Diagnostic Laboratory, University of Wisconsin, Madison, WI 53706, USA.