1. Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada N1G 2W1
2. Department of Human Biology and Nutritional Sciences, University of Guelph, Guelph, ON, Canada N1G 2W1
3. U.S. Department of Agriculture/Agricultural Research Service, The United States Meat Animal Research Center, Clay Center, NE 68933