This is a little harsh. I care a lot, and i really don't want to put the feeders through un-needed suffering. Yet, I use dry ice. It's two seconds and the rat us unconcious. A little longer, and not even a breath of air.
I don't think smashing or cervical dislocation is the best way. Especially to someone who has never done it before. As, I have tried both methods, and neither killed the rat. Not even close. Of course, i only thumped it against the table, and didn't hit it with a hammer or rock. i don't think my stomach can handle that. But, I'm not going to continue to 'practice' on the poor feeders. I'm just going to keep using dry ice. At least I know it's going to work.