Judaism
Torah Commentary: Why Keeping Kosher Never Goes Out of Style
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The excrement from a monogastric (singly-stomached) animal, ours included, is a biological hazard unlike the finely processed, grassy product of a multiply-stomached animal. Therefore, when a society eats meat, there is going to be a lot of whatever livestock they are eating, and thereby a lot of poop! It is then in everyone’s best interest, and obviously so, if this poop can safely be used as manure, as opposed to having to deal with a more hazardous waste product.