1. Centre for Genetic Improvement of Livestock, Department of Animal and Poultry Science, University of Guelph, Guelph, ON N1G 2W1, Canada
2. L'Alliance Boviteq, Saint-Hyacinthe, QC J2T 5H1, Canada
3. Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada