Tyson Foods Inc , the biggest U.S. meat processor, reported better-than-expected quarterly sales on Monday, helped by strong demand for chicken products and a boost from its purchase of sausage seller Hillshire Brands. REUTERS: Tyson Foods Inc , the biggest U.S. meat processor, reported better-than-expected quarterly sales on Monday, helped by strong demand for chicken products and a boost from its purchase of sausage seller Hillshire Brands.