1. Applied Research, Animal Sciences Group, Wageningen UR, Lelystad, The Netherlands
2. Animal Resources Development Division, Animal Sciences Group, Wageningen UR, Lelystad, The Netherlands
3. Institute for Animal Welfare and Animal Husbandry, Celle, Germany
4. Department of Biological Sciences, University of Lincoln, Lincoln, United Kingdom
5. Station de Recherches Avicoles, INRA de Tours, Nouzilly, France
6. Station Experimentale des Palmipedes a Foie Gras, INRA Artigueres, Benquet, France
7. Department of Farm Animal Ethology and Poultry Science, University of Hohenheim, Stuttgart, Germany
8. Department of Zoology, University of Oxford, Oxford, United Kingdom
9. Department of Farm Animal Behaviour and Husbandry, University of Kassel, Witzenhausen, Germany
10. Institute of Animal Hygiene, Animal Welfare and Behaviour of Farm Animals, School of Veterinary Medicine, Hannover, Germany
11. Institute of Animal Breeding and Husbandry, Martin-Luther-University, Halle-Wittenberg, Halle, Germany
12. Institute of Animal Husbandry and Welfare, Bavarian Research Centre of Agriculture, Poing-Grub, Germany
13. Department of Animal Sciences INRAINAPG, Paris, France