1. OK Foods , Fort Smith, AR, USA
2. Department of Poultry Science, Mississippi State University , Mississippi, MS, USA
3. Agricultural Research Service, Animal and Natural Resources Institute , Beltsville, MD, USA
4. Center for Food Animal Well Being, Center of Excellence in Poultry Science, University of Arkansas , Fayetteville, AR, USA
5. Deceased
6. Department of Biological Sciences, University of Wisconsin , Milwaukee, WI, USA