Tyson Foods, Inc. must sell its sow-buying unit, Heinold Hog Markets, to satisfy antitrust rules and proceed with its purchase of Hilllshire Brands Co. for $8.5 billion, the Justice Department said. Without the divestiture, combined companies would account for one-third of sow purchases from U.S. farmers, an unacceptably high portion, the government said. In a joint statement, Tyson… » Read More