1. College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi, USA
2. Warmwater Aquaculture Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Stoneville, Mississippi, USA
3. Department of Biological Sciences, Auburn University, Auburn, Alabama, USA
4. Recombinetics, St. Paul, Minnesota, USA
5. Animal Genomics and Improvement Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland, USA