1. USDA-ARS; U.S. Dairy Forage Research Center; 1925 Linden Dr. Madison WI 53706-1108 USA
2. Dep. of Agronomy; Univ. of Wisconsin; Madison WI 53706
3. Agriculture and Agri-Food Canada; Nova Scotia Agric. College; 58 River Rd. Truro NS B2N 5E3 Canada
4. Agriculture and Agri-Food Canada; 6947 Hwy 7 Agassiz BC V0M 1A0 Canada
5. Univ. of Minnesota; NCROC; 1861 E. Hwy 169 Grand Rapids MN 55744 USA
6. Michigan State Univ.; Upper Peninsula Experimental Station, E3774 University Dr. Chatham MI 49816 USA
7. USDA-ARS; Forage and Range Research Lab.; 6300 Old Main Hill Logan UT 84322-6300 USA
8. Dep. of Crop and Soil Science; Cornell Univ.; 503 Bradfield Hall Ithaca NY 14853 USA
9. Agriculture and Agri-Food Canada; 5403 First Ave. S Lethbridge AB T1J 4B1 Canada
10. USDA-ARS; 1224 Airport Rd. Beaver WV 25813 USA
11. Dep. of Plant Agric.; Univ. of Guelph; 50 Stone Rd. E. Guelph ON N1G 2W1 Canada
12. Dep. of Plant Sci.; Univ. of Saskatchewan; 51 Campus Dr. Saskatoon SK S7N 5A8 Canada
13. Agriculture and Agri-Food Canada; 1468 Rue St. Cyrille Normandin QC G8M 4K3 Canada
14. Dep. of Agronomy and Plant Genetics; Univ. of Minnesota; 1991 Buford Cir. St. Paul MN 55108 USA
15. Dep. of Crop and Soil Sci.; The Pennsylvania State Univ.; Agricultural Science and Industries Building University Park PA 16802 USA
16. Michigan State Univ.; W.K. Kellogg Biological Station Hickory Corners MI 49060 USA
17. Agriculture and Agri-Food Canada; 2560 Boul. Hochelaga City of Quebec QC G1V 2J3 Canada
18. New Liskeard Agricultural Research Station; Kemptville Campus, Box 6007, 340 Armstrong St. New Liskeard ON P0J 1P0 Canada
19. Univ. of Idaho; Twin Falls Research and Extension Center; P.O. Box 1827 Twin Falls ID 83303-1827
20. Virginia Polytech. Institute and State Univ.; 2375 Darvills Rd. Blackstone VA 23824 USA
21. USDA-ARS; 2615 E. 29th St. Marshfield WI 54449-8401 USA