1. Institute for Animal Nutrition; University of Veterinary Medicine Hannover, Foundation; Hannover Germany
2. Department of Nutrition and Nutritional Deficiency Diseases; Faculty of Veterinary Medicine; Mansoura University; Mansoura Egypt
3. Department of Hygiene and Zoonoses; Faculty of Veterinary Medicine; Mansoura University; Mansoura Egypt
4. BEST 3 Geflügelernährung GmbH; Twistringen Germany