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The skies were overcast at this year's World Pork Expo in Des Moines, Iowa. But those clouds may have a silver lining for hog and cattle producers. Iowa State University's Elwynn Taylor told World Pork Expo attendees that the 2012 corn and soybean crops are off to a good start. Taylor said it will be late July, however, before the markets get a better idea of where the crops are headed.