Humane way to euthanize rats?

[Ladybugzcrunch]

cervical dislocation is one way of killing MICE, but is not comon procedure for rats.
spooky

Escuzie
http://ball-pythons.net/forums/showt...ght=euthanasia
It is fairly common. As a matter of fact, this is actually the preferred method of killing rabbits for human consumption. When you gas, and the rat suffocates, it releases lots of lactic acid which makes the meat taste bitter. Can you please enlighten me as to why cervical dislocation is okay for mice but not for rats? They happen to have very similar anatomy.