For the study, researchers placed 12-pound bells around the necks of more than 100 cows at 25 farms across Switzerland. In a series of experiments, the scientists observed the cows' activity, heart rates, head movements, and feeding behavior. Then they exposed the cows to loud noises and observed their reactions.
What did they find? After wearing the bells, some of the cows became unresponsive to sound--perhaps not such a big surprise, since the bells' sound was measured at 113 decibels, or almost 30 decibels above noise levels that can cause hearing damage in humans. The finding suggests that many cows that...
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