Dr. Dersjant-Li is technical services nutritionist for ADM Specialty Ingredients (Europe) B.V., Koog aan de Zaan, The Netherlands. She can be contacted at: Tel: +31.75.64.64.212, Fax: +31.75.64.64.165, E-mail: [email protected]. Dr. Hill is manager of technical and marketing support-Companion Animals for ADM Animal Health & Nutrition, Quincy, Illinois, USA. He can be reached at Tel: +1.217.231.2238, Fax: +1.217.231.2335, E-mail: [email protected].