U.S.

Associated Press
A May 16, 2012, photo shows Lucky, a dairy cow on the Meyer farm in Chilton, Wis. Lucky's owners said that after she began limping and laying around more, they hired a chiropractor to adjust her and have seen positive results. It's all part of the effort to ensure maximum milk output. There's no sound scientific data to back up the claims, but dairy farmers say they believe they're seeing improved productivity. (AP Photo/Carrie Antlfinger)

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