Washington-The USDA World Agricultural Supply and Demand Estimates released Sept. 11 says higher forecast U.S. corn production this month boosts 2009-10 feed grain supplies; however, increased projections for exports and feed and residual use limit the increase in ending stocks. The U.S. corn production forecast is 13 billion bushels, 193 million higher than in August, with higher expected yields throughout most of the Corn Belt. The national average yield is projected at a record 161.9 bushels per acre.