Humane way to euthanize rats?

[babyknees]

I dont breed rats, I actually get f/t for my normal, who I've had for a while. But the new guy isn't eating at all, and he ate live before I got him. So I offer a live rat once a week. Which he doesn't eat. So, I have to kill them, and I do hate doing it...

I would suggest gassing (which can be accomplished with a cooler and dry ice) or just keeping them alive so you can reuse the same rat eat week. When you have a live eater it never hurts to have a rat set-up ready to go.