1. Food Animal Health Research Program, Department of Veterinary Preventive Medicine, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, Ohio 44691-4096
2. Department of Poultry Science and Animal and Poultry Waste Management Center, North Carolina State University, Raleigh, North Carolina 27695
3. Department of Food, Agricultural, and Biological Engineering, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, Ohio 44691-4096