FILE - In this Aug. 24, 2010 file photo, patrons enjoy a meal at a Burger King in Springfield, Ill. The movement by U.S. food corporations toward more humane treatment of animals experienced a whopper of a shift Wednesday, April 25, 2012, when Burger King announced that all of its eggs and pork will come from cage-free chickens and pigs by 2017. The decision by the world's second-biggest fast-food restaurant raises the bar for other companies seeking to appeal to the rising consumer demand for more humanely produced fare.(AP Photo/Seth Perlman)
In a boost to animal welfare activists looking to get livestock out of cramped cages, Burger King will be the first major U.S. fast-food chain to give all of its chickens and pigs some room to roam.
On Wednesday, the world's second-biggest burger chain pledged that all of its eggs and pork will come from cage-free chickens and pigs by 2017, hoping to satisfy rising consumer demand for humanely produced fare and increase its sales in the process.
Other companies have made similar but less broad announcements this year, part of an industry-wide shift to consider animal welfare when buying food supplies.
"Even if you're buying a burger, you want to buy it from someone you like and respect," said food industry analyst Phil Lempert, who writes a daily industry newsletter. "It's proven that consumers are willing to pay a little bit more for fairness, whether it's to humans or animals."
Conventionally raised eggs come from hens confined in "battery cages," which give them roughly the same space as a sheet of standard notebook paper. Most pork comes from sows confined during their four-month pregnancies in narrow crates.
The hens would still be housed in a barn, but they have room to move and perches and nesting boxes. Sows are also held indoors, but they would not be confined in the cramped crates while they are pregnant.
Egg and pork producers have argued that easing confinement standards for animals raises production costs and makes those who adjust their practices less competitive.
Animal welfare groups applauded Burger King's decision.
Burger King uses hundreds of millions of eggs and tens of millions of pounds of pork annually, and its decision could be a game-changing move in the supply business as a huge new market opens up for humanely raised food animals.
Already 9 percent of the company's eggs and 20 percent of the pork served at its 7,200 restaurants are cage-free.
The Miami-based company has been steadily increasing its use of the eggs and pork as the industry has become better able to meet demand, said Jonathan Fitzpatrick, chief brand and operations officer. Fitzpatrick said the decision is part of the company's social responsibility policy.
In recent months, other companies have announced similar policies.
Chipotle, with just over 1,200 restaurants, made a splash during the Grammy Awards in February with its viral commercial detailing the company's commitment to humane treatment of animals and healthy food. After the commercial created so much buzz, other companies were quick to announce new policies, Lempert said.
So far this year, McDonalds and Wendy's said they asked their pork suppliers to outline plans for the elimination of gestation crates, but didn't set a timetable. Also, Smithfield Farms and Hormel committed to ending the use of crates by 2017.
Wal-Mart and Costco have shifted their private-label eggs to 100 percent cage-free. Unilever, which uses 350 million eggs a year in its Hellmann's mayonnaise brand, is switching to 100 percent cage-free. Others, such as chain restaurants Sonic, Subway and Ruby Tuesday and manufacturers such as Kraft Food and ConAgra Foods, are incorporating some percentage of cage-free eggs in their products.