1. Companion Animal Nutrition Laboratory, Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843, USA
2. Intercollegiate Faculty of Nutrition, Texas A&M University, College Station, TX 77843, USA
3. The Nutro Company, 1550 West McEwen Drive, Franklin, TN 37067, USA
4. Minato-Yokohama Animal Medical Research Center, Yokohama, Kanagawa 235-0023, Japan
5. Kao Corporation, 2606 Akabane, Ichikai-machi, Haga-gun, Tochigi 321-3497, Japan