McDonald's three-tiered plan made it clear that it'll cut unnecessary antibiotic use in its poultry in U.S. markets by January 2018 and in all global markets by January 2027. But, the restaurant chain failed to give specific deadlines for pork and beef. "We remain committed to making meaningful reductions in the use of antibiotics in beef and pork and will share our progress on beef in 2018," Marion Gross, senior vice president for McDonald's North America supply chain, said in a statement.