1. Department of Animal Science, University of Nebraska, Lincoln, NE
2. Beef Improvement Opportunities, Elora, Ontario, Canada
3. Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, São Paulo, Brazil
4. Department of Animal Science, Universidade Federal de Viçosa, Viçosa, Brazil
5. Department of Mathematical Sciences, Ritsumeikan University, Shiga, Japan