1 Nestlé Purina Research, Checkerboard Square, St. Louis, MO 63164, USA. Electronic address: Dorothy.laflamme@rd.nestle.com.
2 Department of Small Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University College Station, TX 77843-4474, USA. Electronic address: DZORAN@cvm.tamu.edu.