this post was submitted on 24 Sep 2024
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On a pet forum people regularly talk about (and suggest to others) how they euthanize their old / sick rodents at home using carbon-dioxide unlike nitrogen like this capsule uses. I looked into what's the difference and it turns out inhaling pure carbon-dioxide instantly causes panic and the sense of suffocation and it's a horrible way to die. They were even able to cause an panic attack on a person physically uncapable of experiencing fear. There are videos online about killing pigs like this and it's not a pretty sight. Suffice to say I no longer take advice from those people.
Ya CO2 is basically the feeling of normal suffocation. Might as well hold a plastic bag over their head.
Co2 reaction is highly, highly concentration-dependent. Rodent euthanasia ideally starts around 20% which makes them cranky and sleepy, they go to sleep, then concentration is upped to around 80% and they die very quickly. Yes, they feel bad when they go to sleep, but it is a mild bad and it's all over quickly. Rodent euthanasia horror stories are about getting the concentration wrong, not the co2 itself.
Nitrogen - as long as the flow is strong enough to remove exhaled co2 - won't make anyone cranky, but it takes longer, and the longer it takes the higher the risk of something going wrong with the setup. So, tradeoffs.
Wouldn't NO2 work too at similar cost? Or Helium?