Attached are pics of regular rat racks, mouse tub, and soft fur rack.
For regular rat racks (black tubs/wooden frames), I use groups of two females per tub. They're raised together, and will help one another raise babies. Males are rotated through the tubs, left in each for about two weeks. (when girls are looking noticeably pregnant) Moms have babies, care for them, and when they're big enough to wean I pull them and put them in one of my growout bins. The pink tags in the picture are tags I have on all my tubs. I jot down info on each, like when tub was last cleaned, when male was put in, when babies were born, etc.
Mice I put in the big sterilite tubs I've modified for them. I use one male, and three females. They are all raised together and I leave the male in at all times. Same as above - moms have babies, care for them communally, and when they're large enough to wean I put them elsewhere to grow up to the size I need.
Soft furs I raise in ten gallon tanks. One male, two females. I use tanks for soft furs because they love to chew and there's no way in hades I'd trust these guys in anything plastic. Groups are raised together from weanlings, and are cared for as the rats and mice above.
Last pic is my growout troughs for my soft furs. They take so long to grow to a decent size, that I just put them in these and kind of forget about them for a couple months. They are rigged with automatic waterers, and modified hog feeders that will hold their lab block.
Everything eats Mazuri 6F. It's just what I can get easily, locally.
All my feeder breeders get things to mentally stimulate them. Wheels for soft furs and mice, wood blocks to chew, foraging treats, cardboard tubes, etc.
Good luck!
