Burger King pledges to end use of caged pigs, hens

On Wednesday, the Miami-based chain committed to serving 100 percent cage-free eggs in its U.S. restaurants by 2017 and to buy pork only from suppliers with documented plans to end their use of gestation crates for breeding sows.McDonald's, the top U.S. hamburger chain by sales, vowed in February to work with its U.S. pork suppliers to phase out the use of gestation crates. Domestic pork producers confine millions of sows in cramped stalls while they raise piglets.Wendy's Co, which recently edged out Burger King to become the No. 2 hamburger chain in the United States, made a similar announcement in March.