Don't put rats or mice in the freezer alive to freeze to death. You either have to break there neck (which I couldn't do) or make a co2 chamber. All you do is get a regular paintball tank and paintball remote line and a tub big enough for how many you want to do at once and run the remote line into the tub by putting a hole in the side at the bottom and put some silicon or epoxy around the edge of the line so you have an air tight seal and to keep it from falling out then you put a small air hole toward the top of the tub so the co2 can push the air out. Then you just lay down some paper towels and put rodents in and slowly turn on the remote line and they will lay down and fall asleep and then you turn the co2 on little more to flood the chamber and your done. It only takes about 2-3 minutes to do one small rat. I have my home made chamber still since I was trying to get my male to eat since he wasnt eating regularly and he was on f/t so I was going to try pre killed so I made my own chamber and he didn't eat any of the ones I gassed but I froze them and he eventually ended up eating them. So now I have a co2 chamber for no reason lol
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