1. Animal and Poultry Science, University of Saskatchewan College of Agriculture and Bioresources, Saskatoon, Saskatchewan, Canada
2. Campbell Centre for Study of Animal Welfare, University of Guelph, Guelph, Ontario, Canada
3. Dept of Pathobiology, University of Guelph, Guelph, Ontario, Canada
4. Poultry Diagnostics and Research Center, Department of Population Health, University of Georgia, Athens, GA, USA