Think of how much water and soil they would take if they lived out their whole lives and reproduced Un-controllably
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They don't even repoduce!!! The farmer makes the cows pregnant artificially!!!
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And how is that worse than them doing it in the wild?
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When they live in the wild and they reproduce too much, they don't have enough food anymore and alot of them die, than they start reproducing again, this keeps happening, 'till they're stable. But probably these animals can't even survive in the wild, they aren't bred for that, it's like letting a dog live in the wild, most of them just die, they will never overpopulate.