Kenric J. Walburger, Department of Animal and Poultry Science, University of Saskatchewan, 51 Campus Dr., Saskatoon, SK S7N 5A8, Canada, Timothy DelCurto, Department of Animal Sciences, Eastern Oregon Agriculture Research Center, Oregon State University, Box E, Union, OR 97883, and Martin Vavra, Forestry and Range Sciences Laboratory, Pacific Northwest (PNW) Research Station, USDA Forest Service, 1401 Gekeler Lane, La Grande, OR 97850.