1. Centre of Genetic Improvement of Livestock, University of Guelph, 50 Stone Rd E, N1G 2W1 Guelph, ON, Canada.
2. Lactanet, 660 Speedvale Ave W, N1K 1E5 Guelph, ON, Canada.
3. Department of Animal and Veterinary Sciences, Scotland’s Rural College, Easter Bush, Midlothian EH25 9RG, United Kingdom.
4. Institute of Genetics, Vetsuisse Faculty, Länggassstrasse 120, 3012 Bern, Switzerland.