Ben Hileman1, Matthew J. Rinella2, and Bret Olson1. (1) Animal and Range Sciences, Montana State University, 119 Linfield Hall, PO Box 172900, Bozeman, MT 59717-2900, (2) ARS, Fort Keogh Livestock and Range Research Laboratory, 243 Fort Keogh Rd, Miles City, MT 59301