[wisema2297]

I am new here but will share my experiences. CO2 will not kill new born mice. They have a reflex that keeps them from suffocating. I simply freeze them in an air tight bag. Since they have such a high surface to area ratio they freeze very fast (2-3 minutes). I know this sounds inhumane, but it's the only way i can think of to store hundreds at a time. I do not raise adult mice so I can't comment on storing them. I just raise pinkies for my corn snake hatchlings ( and hopefully my garter if I can convert him) and when I have enough stored I feed the adult mice to my adult corns.