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Associated Press
FILE - In this Jan. 26, 2015 file photo, a hornless cow stands in a dairy barn at Fair Oaks Farms in Fair Oaks, Ind. Fair Oaks, one of the nation’s largest dairy farms with 36,000 cows, is phasing out the use of milk cows with horns _ unruly cows can be hazardous because they can gore farm workers or other animals. About a quarter of its newborn calves are hornless due to selective use of bulls with the polled gene, a dominant no-horn genetic trait. AP Photo/Michael Conroy, File)

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