1. Pfizer Animal Health, 5 Giralda Farms, Madison, NJ 07940
2. Agri Research Center, Inc., Canyon, TX 79015
3. Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506
4. Johnson Research, Parma, ID 83660
5. Horton Feedlot and Research Center, Wellington, CO 80549
6. Beef Carcass Research Center, West Texas A&M University, Canyon 79016