NEW YORK (MarketWatch) -- McDonald's MCD, -1.03% announced on Wednesday a new menu policy Wednesday to only use chickens raised without antibiotics, and to offer milk from cows that aren't treated with artificial growth hormones. "Our customers want food that they feel great about eating -- all the way from the farm to the restaurant -- and these moves take a step toward better delivering on those expectations," said Mike Andres, McDonald's U.S President. McDonald's is working with U.S. farmers and they expect to put the antibiotics policy in place within the next two years. The new policy will not prohibit farmers from treating sick chickens with antibiotics, but rather those chickens will not be used by McDonald's, the release states. Additionally, low-fat white milk and fat-free chocolate milk jugs will not contain the rBST growth hormone due to customer preferences. The stock, a component of the Dow Jones Industrial Average, fell 0.4% in morning trade. It has gained 3.8% in the past three months, while the Dow has edged up 0.8%.