1. Institute of Animal Nutrition, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institute, Germany
2. Institute of Animal Welfare and Animal Husbandry, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institute, Germany
3. Institute of Farm Animal Genetics, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institute, Germany
4. Lohmann Tierzucht GmbH, Germany
5. Institute of Physiology, University of Veterinary Medicine, Germany