You give cattle antibiotics for the same reason a human would need an antibiotic. Only if they have an injury or pneumonia. Even at feed lots they are not given routinely or as a prophylactic. That is PETA and HSUS's propaganda "lets scare the public away from beef."
Pigs are fed in confinement they get antibiotics in their feed. Maybe this is where that idea comes from.
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Speaking simply... do not confuse this with having a simple mind.
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