Feeder Mice

[pigglet]

I'm thinking about breeding feeder mice for my snakes, and have read a few care sheets, but am a little hazy on a few points.

1) Every care sheet said something different in regards to the m/f ratio and the frequency of breeding. Is it neccessary to separate the female from the male after she has had her litter, in order to prevent a new impregnation too soon? I gather a 4-6 f/1 m ratio in a 20g enclosure is good, correct?

2) What are all the humane methods of euthanasia?

how is CO2 'suffocation' done? I would prefer not to do the spinal cord severing, but will if it is the most reliable and humane method. These are basically the only two I have read about.

3) Should I freeze the prey first in order to guarantee parasite free food?

Thanks for the help, feel free to add any other comments/advice.

~Pigglet