1. The Bureau of Biotechnology in Livestock Production, Department of Livestock Development, Pratumtani, 12000, Thailand.
2. Department of Animal and Dairy Science, The University of Georgia, Athens, GA 30602, USA.
3. USDA Agricultural Research Service, Miles City, MT 59301, USA.
4. Department of Poultry Science, The University of Georgia, Athens, GA 30602, USA.