1. Laboratory of Animal Nutrition, School of Veterinary Medicine, and Laboratory of Biological Chemistry, School of Medicine, Aristotle University, 54006 Thessaloniki, Greece; School of Food Science and Technology, Technological Education Institute T.E.I. of Thessaloniki, Greece; and Laboratory of Hygiene of Foods of Animal Origin, School of Veterinary Medicine, University of Thessaly, 43100 Karditsa, Greece