A major South Korean retailer said Thursday it has resumed sales of US beef after briefly suspending them following a new case of mad cow disease in California.Homeplus, one of the three largest discount chains and a local unit of Britain's Tesco, ended the nine-hour suspension on Wednesday night, its spokeswoman told AFP."We resumed displaying and selling US beef at our stores... as the government said there was little possibility that the beef contaminated with mad cow disease had been imported here," Homeplus said in a statement.