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CO2 is quite quick when at high concentrations (we used it when we had to euthenase lab rats) and they are breathless but unconscious.
The other thing we used to do was chloroform them asleep and then administer cervical dislocation (ie use heavy wire cutters and break their necks at the spine). Its faster and a lot neater than the brick therapy. Interesting that someone has gone into a lot of detail about carbon dioxide and animal death.........it takes all sorts
Cheers Hawkeye
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