1. The Iams Company, 6574 State Route 503 North, Lewisburg, OH 45338, USA
2. Centre for Nutrition Modelling, Department of Animal and Poultry Science, University of Guelph, 50 Stone Road East, Guelph, Ontario, N1G 2W1, Canada
3. Department of Molecular Biosciences, School of Veterinary Medicine, University of California, One Shields Avenue, Davis, CA 95616, USA