Caring for your mousery

The following is written for all feeder mice species who shouldn't live permanently in a mixed group.

Female babies can stay with their mother, the males must be separated when they are around four weeks old. You will need at least three cages: males, females, male juveniles

Make photos of your breeding mice so that you can keep track of their age, development and breeding success, this is especially important when female offspring stay with the group. That way, you can avoid that females are bred when they are too young or have too many litters. Mice with different fur colours are obviously better suited for this.
If you do have mice that look similar (pink eyed whites for example), female offspring cannot stay with the group since after a few weeks you won't be able to tell them from their mothers and you cannot control the number of litter per animal that way. A mousery with similar looking animals needs to consist of four cages because of that.

Introducing female that have a litter should be avoided since the babies are often killed by the animals added to the group. This is a risk for all babies, from newborns to an age of about three weeks.

Translation
Jedediah