1. Animal and Poultry Science, University of Guelph, 50 Stone Road E., Guelph, ON, Canada N1G 2W1
2. Animal Breeding and Genomics Centre, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands
3. Avian Science Research Centre, SRUC, Auchincruive Campus, Ayr, KA6 5HW, United Kingdom
4. Field Research Station at Fort Missoula, Division of Biological Sciences, University of Montana, Missoula, MT 59812, USA
5. Research Center for Proper Housing: Poultry and Rabbits (ZTHZ) Division of Animal Welfare, VPH Institute, University of Bern, Burgerweg 22, 3052 Zollikofen, Switzerland