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Last year, it was all about poultry: Major fast-food companies like McDonald’s announced that they would move away from chicken raised with antibiotics, and numerous retailers said they would switch over to cage-free eggs. The changes could redefine the status quo for raising poultry in the U.S., but in addition to pointing out that antibiotic- and cage-fee isn’t the same as humane treatment of livestock, animal rights groups had one overarching question: Why only chickens?