I have 2 snakes. 1 eats large pinkies and one eats small adult mice. I have three females and if I find that I want to breed my own mice I will get a male, but frist I want to know How often would I need to breed my fancy mice to always have mice on hand to feed the snakes? and How big of a cage would I need for 1:3 mice and babys. How meny would I have to save from each litter for the larger snake? Thanks.