Controversy over whether animals are being raised humanely for human consumption has escalated with a pledge by Burger King to phase in purchases of pork and eggs for its breakfast sandwiches from suppliers that do not confine pigs and chickens in crates or cages.The world’s second-largest hamburger chain said it would start buying 10 percent of its pork from suppliers that don’t use gestation crates. BK also said it plans to purchase 2 percent of its eggs from suppliers that have eliminated ...

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