1. USDA‐ARS, Jornada Experimental Range Las Cruces NM 88003 USA
2. Univ. of Florida, Range Cattle Research Experiment Station Ona FL 33865 USA
3. Agriculture and Agri‐Food Canada, Agassiz Research and Development Centre Agassiz BC V0M 1A2 Canada
4. New Mexico State Univ. Extension Animal Sciences and Natural Resources Las Cruces NM 88003 USA
5. USDA‐ARS, Pasture Systems and Watershed Management Research Unit University Park PA 16802 USA
6. New Mexico State Univ. Jornada Experimental Range Las Cruces NM 88003 USA
7. USDA‐ARS, Soil Management and Sugar Beet Research Unit Fort Collins CO 80526 USA