1. Center for Food Safety–IFSE, and Department of Food Science, University of Arkansas, Fayetteville, Arkansas.
2. Current address: Department of Food Science, Nutrition and Health Promotion, Mississippi State University, Mississippi State, Mississippi.
3. USDA-ARS, Food and Feed Safety Research Unit, College Station, Texas.
4. USDA-ARS, Livestock Issues Research Unit, Lubbock, Texas.
5. Range Cattle Research and Education Center, University of Florida, Ona, Florida.