2005 Annual Report 4d.Progress report. This report serves to document research conducted under a reimbursable agreement between ARS and the United Soybean Board. Additional details may be found under the parent project 3611-21000-018-00D, Soybean Genetic Resources Management and Utilization. From 450 F2:4 lines tested in 2004, 107 were selected for high yield and planted for re-selection in 2005. The highest yielding 30 populations were made available to all public soybean breeders and seeds were distributed to 10 breeders. 250 experimental lines, divided in 8 tests, were made available for cooperative testing with private industry. Seeds were distributed to over 20 breeders in 5 companies for yield testing. We entered 7 experimental lines in the Uniform Preliminary Tests and 1 experimental line in the Uniform Tests. These 8 lines have 19 exotic parents in their pedigrees. Most are 50% exotic parentage but the lines range from 25 to 75% exotic parentage. Over 1300 lines derived from exotic germplasm are being tested in 4 row yield plots in 2005. These lines are derived from over 80 exotic parents.