I've got a large welding tank of CO2 that I use along with a regulator that lets me control the gas flow. I've pretty much got it set as low as it will go, and I let it run for 10 minutes or so. They'll gradually take slower and longer breaths until they stop.
With the argon it looked more like hyperventilating, they would pick up speed with how fast they were gasping for breath and they would squeak with every breath until they stopped. Whether that squeak was voluntary or not I don't know.
As far as which is a better way to go for the rat I really don't know, but the CO2 sure looked like a nicer way to go than the argon.
Thank you for your input. Perhaps I should go with CO2.
Originally Posted by m00kfu
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