(marked this as engineering because I’m not sure what it would fall under, biology maybe?)
I’ve seen in a documentary where they would put pigs in cages and lower them into a pit of CO2, but it doesn’t kill quickly and the pig would thrash around violently as it was slowly poisoned. Why not just use CO? it would kill humanely, and from what I understand, a lot of packaged meat is packaged in containers with CO to prevent spoiling, so there must be no safety issue with the meat.
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CO is used on mink farms. I know a family that runs a mink farm. Their slaughtering method is an airtight container that has the exhaust from a small engine piped into it. A few years ago the old engine went out and they replaced it with a brand new honda engine. The new engine was so efficient that it’s exhaust was no longer deadly. They had to find another old engine to replace it with.
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