1. Prairie Swine Centre, Inc., Saskatoon, SK S7K 3J4, Canada
2. Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada
3. Swine Research Centre, Trouw Nutrition R&D, Boxmeer 5831 JN, The Netherlands
4. Department of Animal Biosciences, University of Guelph, Guelph, ON N1G 1Y2, Canada