University of Illinois Nutrition Professor Larry Berger holds a handful of cattle feed that has been supplemented with distillers' grain May 10, 2004, at the school's South Farms in Champaign, Ill. Berger says that early findings of a UI study expected to be completed next month show the protein supplement, ethanol's leftovers, may help cattle producers cut their feed costs while maintaining the quality of their animals when it comes time to go to the slaughterhouse. (AP Photo/Tom Roberts)