1. Prairie Swine Centre, Inc. , Saskatoon, SK , Canada S7K 3J4
2. Swine Research Centre, Trouw Nutrition R&D , Boxmeer 5831JN , The Netherlands
3. Department of Animal and Poultry Science, University of Saskatchewan , Saskatoon, SK S7N 5A8 , Canada
4. Research and Discovery , Zinpro Corporation, Eden Prairie, MN 55344 , USA
5. Department of Animal Biosciences, University of Guelph , Guelph, ON , Canada N1G 1Y2