1. Department of Animal Science, North Carolina State University, Raleigh, NC 27607, USA.
2. Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, 50144 Florence, Italy.
3. URUS Group LP, Madison, WI 53718, USA.
4. Animal Genomics and Improvement Laboratory, Henry A. Wallace Beltsville Agricultural Research Service, USDA, Beltsville, MD 20705, USA.