1. Department of Animal Sciences, Purdue University, West Lafayette, IN 47907, USA.
2. Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
3. Centre for Nutrition Modelling, Department of Animal Biosciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
4. Department of Animal Sciences, Federal University of Viçosa, Viçosa, Minas Gerais 36570-000, Brazil.
5. Vetsuisse Faculty, Institute of Genetics, University of Bern, Bern 3001, Switzerland.