I'm trying to use up the frozen rats & mice I've already got and at the same time, use this chamber also on feeding day. So, the're getting both right now. I'm sure that eventually, my rat colony is going to take off and I'm going to have to store them in a freezer.

My wife suggested that I gas them enough to knock them out, but not kill them. Then introduce them, hearts still beating, to the snake. They will take it and do their thing and feel the heart stop when they're constricting. Nature in action, only with safety precautions in place.