Tyson Foods Inc TSN.N fell sharply after missing analysts' estimates for quarterly revenue and profit. By Carolina Mandl, Shubham Batra and Johann M Cherian Feb 6 (Reuters) - The main U.S. stock indexes ended lower on Monday as investors shifted gears after considering the possibility that the U.S. Federal Reserve may take longer to start cutting interest rates. U.S. Treasury Secretary Janet Yellen said on Monday the United States may avoid a recession as inflation is coming down while the labor market remains strong.