Tyson Foods gained 3 per cent in early trading Monday after reporting earnings that were higher than analysts were expecting.
The Dow Jones industrial average rose 71 points, or 0.4 per cent, to 18,096 in early trading.
The Standard & Poor's 500 index rose nine points, or 0.4 per cent, to 2,117. The Nasdaq composite rose 24 points, or 0.4 per cent, to 5,030.
In Europe, France's CAC-40 rose 1.1 per cent to 5,103 and Germany's DAX added 1.4 per cent to 11,611. British markets were closed for a public holiday.
Oil slipped 48 cents, or 0.6 per cent, to $58.78 a barrel.
Bond prices rose. The yield on the 10-year Treasury note fell to 2.10 per cent.