Analysts said the smaller crop size will likely prompt an uptick in buying by end users--such as ethanol plants and livestock farmers--who have so far been counting on bountiful corn supplies to meet their needs. Corn buyers may also increase purchases in light of wintry weather that could slow down transport of crops. Wheat prices rose amid speculation that overseas demand for U.S. supplies could increase as prices rise elsewhere in the world. Weather forecasts for an upcoming cold snap and snowfall in key wheat-growing regions this week also lifted prices.