1. Science and Innovation for Sustainable Poultry Production (WING), University of Veterinary Medicine Hannover, Foundation, D-49377 Vechta, Germany
2. Institute for Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, D-30173 Hannover, Germany
3. Institute for Animal Hygiene, Animal Welfare and Farm Animal Behaviour, University of Veterinary Medicine Hannover, Foundation, D-30173 Hannover, Germany