Using exhaled breath to create co2?

[MDT]

I read the paper... I see zero clinical application to the use of CO2 on neonatal rat neural tissue in a practical application. In terms of the strict definition of "analgesia and anesthetic", I'll concede your point. However, I would venture that there will be a total of zero people who "anesthetize" properly w CO2 before they whack their rats for feeding. Not for lack of empathy, but for lack of appropriate monitoring equipment (not readily accessible or cost effective for the average person).....Just do what Lankyrob recommended. Easier, cheaper, faster and much more reliable.