1. USDA-ARS, Grain, Forage, and Bioenergy Research Unit, 137 Keim Hall, Dep. of Agronomy and Horticulture; Univ. of Nebraska-Lincoln; Lincoln NE 68583-0937
2. USDA-ARS; Forage and Range Research Lab.; Logan UT 84322-6300
3. USDA-ARS; Ft. Keogh Livestock and Range Research Lab.; Miles City MT 59301-4016
4. USDA-ARS; Northern Plains Research Lab.; Mandan ND 58554
5. Univ. of Nebraska Panhandle Research and Extension Center; Scottsbluff NE 69361
6. Animal Science Dep.; Univ. of Nebraska-Lincoln; Lincoln NE 68583