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McDonald's USA says that within 10 years, all of its eggs will be from chickens that have some freedom to roam. It's another signal that the egg industry is abandoning traditional cages.
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This is the worst outbreak since the H5N2 influenza was first detected in December. The disease has been found in seven other states over the past five months.
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The results are in from a long-running study of three different ways to house egg-laying chickens. It found that more hens survive in cages, and cages are cheaper. But consumers prefer cage-free eggs.
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In many countries, eggs aren't refrigerated and they're still considered safe to eat. But in the U.S., we have to chill them, because we've washed away the cuticle that protects them from bacteria.