1. Department of Animal and Dairy Sciences, Mississippi State University, Mississippi State, Mississippi.
2. Department of Biological Sciences, Mississippi State University, Mississippi State, Mississippi.
3. Food and Feed Safety Research Unit, Agricultural Research Service, U.S. Department of Agriculture (USDA), College Station, Texas.
4. Livestock Issues Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Lubbock, Texas.
5. Department of Animal and Food Sciences, Texas Tech University, Lubbock, Texas.
6. Animal Science Department, University of Nebraska, Lincoln, Nebraska.