Mice:
Breeding age: about 6-8 weeks of age
Litter size: 8-12
Gestation period: about 21 days
Weaned: 3-4 weeks
Males should be separated from the females at 4 weeks of age
Females can be separated from their mothers at 4 weeks of age.
The females can be left with their mother but better to separate them at 4 weeks to ensure their father doesn't impregnant them. Inbreeding for a few generations is fine but too much can weaken the genepool too much.
Food: 19% min Protein and 8% min fat dog or cat food is alright (find one with no dyes or preservatives is best). ALso mix in a budgee seed mix and raw sunflower seeds and cracked corn, for a bit of variety. Whole grain unsweetened cerials are nice too (ie cheerials, Total cerial).
Rats:
Breeding Age: 4-6 months
Litter Size: 10-18
Gestation Period: 21-25 days
Weaned: 3-4 weeks
Males should be separated from females by 4 weeks of age.
Everything else is same as mice
Note on mice:
Male mice produce a strong musk odour that can get rather unpleasant to some people. Vanilla extract (artifical is fine) mixed into their water (about one drop to gallon of water) tends to help keep down the smell of males, though I personally haven't noticed any difference when I use this mixture or not.
Male Rats do not have this same musk.