1. Food and Feed Safety Research Unit, Southern Plains Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, College Station, Texas.
2. Livestock Issues Research Unit, Lubbock, Texas.
3. Range Cattle Research and Education Center, University of Florida, Ona, Florida.
4. Department of Animal Science, Texas Tech University, Lubbock, Texas.
5. Center for Food Safety, University of Arkansas, Fayetteville, Arkansas.