Marion Gross, senior vice president and chief supply chain officer of McDonald's North America, said the use of cage-free eggs "is another big milestone building on our work with industry experts and suppliers to improve the treatment of animals".
"Animal welfare has always been important to us and our customers", Gross said.
Earlier in March, McDonald's said that by 2017 it would be using chickens that are completely raised without antibiotics used as human medicine, as well as offering milk from cows that have not been treated with artificial growth hormone rbST.
"Our decision to source only cage-free eggs reinforces the focus we're placing on food quality and our menu to meet what consumers truly want", said McDonald's USA President Mike Andres.
One of McDonald's' egg suppliers, Herbruck's Poultry Ranch, welcomed the latest announcement, saying it would "continue embracing new technologies and strategies to ensure our hens are well-cared for".
In 2000 McDonald's USA adopted a standard for hen housing systems, which provided more space per bird than the industry standard.
Every year McDonald's USA and Canada buy about two billion eggs and 120 million eggs, respectively, to serve on its breakfast menus. Since 2011, McDonald's USA has been purchasing more than 13 million cage-free eggs annually. McDonald's USA buys 3% of all domestically produced eggs.