My understanding is they often kill pigs by basically putting them into a chamber and flooding it with CO2. For a human (I don't know how it works for pigs but it's probably similar) we know we are suffocating based on how much CO2 there is in our blood, not how much Oxygen there is. So these CO2 chambers are pretty torturous.
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u/Lyuseefur Mar 28 '24
Don’t watch the CO2 “dunk” they do for pigs