Just a thought about number of rats/mice as far as the size of their tubs. Just be careful to not overcrowd them too much. Even though they are destined to be fed off it's still only right to give them all reasonable room to move around as well as good ventilation especially when using pine bedding.

You may want to consider keeping one mother per enclosure when they have babies as rats can steal babies back and forth and end up hurting the young rats or get stressed enough to cannabalize their own young.


~~Jo~~