Alright...this how I would do it.
Build yourself some racks using medium sized Petmate litter pans. They are 16" x 12" x 4" which is a great size for running 1.2 mice in.
You can build these racks 8 levels high with NO problems.
This gives you 16 females per rack. This should get you about 128 babies per month.
You will need four racks like this. Introduce the trios in the first rack on day one. Introduce the trios in the second rack on day seven. The third rack on day 14. The fourth rack on day 21. This should mean that they will be giving birth in about 1 week increments.
Then you will need grow out racks for all of your little mice.
You will need to grow them to at least 16 weeks to really reach adult size.
You will need to separate the grow outs by sex so you don't end up with a ton of unwanted inbred babies.
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