1. USDA-ARS, US Dairy Forage Research Center; 1925 Linden Dr. Madison WI 53706-1108
2. USDA-ARS (retired); Lincoln NE 68583
3. Dep. of Crop Sciences; Univ. of Illinois; Urbana IL 61801
4. USDA-ARS, Grain Forage and Bioenergy Research Unit, 251 Filey Hall; Univ. of Nebraska; Lincoln NE 88583-0937
5. USDA-ARS, Pasture Systems and Watershed Management Research Unit; University Park PA 16802
6. Horticulture and Crop Science Dep.; The Ohio State Univ.; Kottman Hall Columbus OH 43210
7. Dep. of Agronomy; Purdue Univ.; West Lafayette IN 47907
8. Division of Plant Sciences; Univ. of Missouri; Columbia MO 65211
9. Dep. of Plant Science; South Dakota State Univ.; Agricultural Hall Brookings SD 57007
10. North Central Research and Outreach Center; Univ. of Minnesota; Grand Rapids MN 55744
11. Dep. of Plant Soil and Microbial Sciences; Michigan State Univ.; East Lansing MI 48824
12. Dep. of Agronomy; Kansas State Univ.; Manhattan KS 66506
13. Dep. of Agronomy; Iowa State Univ.; Ames IA 50011