1. Department of Animal Science, University of Manitoba , Winnipeg, Manitoba R3T 2N2 , Canada
2. National Centre for Livestock and the Environment , Winnipeg, Manitoba R3T 2N2 , Canada
3. Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada , Lethbridge, Alberta T1J 4B1 , Canada
4. Feedlot Health Management Services Ltd , Okotoks, Alberta T1S 2A2 , Canada