Cattle, horses, and other grazing animals are much more sensitive to high-pitched noise than people are. Cattle are most sensitive at 8000 hz,[4] and people are most sensitive at meq 1000 to 3000 hz. Research has shown that people yelling will raise the heart rate of cattle more than the sound of a gate slamming.[5] People working with animals should be quiet and refrain from yelling and whistling. In one study, cattle with an excitable temperament that became agitated in an auction ring were more sensitive to sudden movement and yelling, compared to calmer cattle.[6]

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