Culling small mice

[Stewart_Reptiles]

Is there a time when rats should be culled in the freezer or are they separate and need co2 all the time? I guess it's kind of moot since balls usually start on mice and then move to rat pups, but I'm still interested to know.

Also, does it matter what kind of freezer? Like between the manual and auto defrosting freezers?

Small rodents (rats, mice, gerbils, ASF ...) under 10 days of age are all hypoxia resistant as mentioned above so freezing is recommended.

After that you should use CO2, cervical dislocation is also a method that is used but it will depends on the size of the animal and the number of animals that have to be dispatched.