I pair 1:5 for 24 days then remove the male and place him in another tub with 5 females, and have good results just leaving all the females together. Minimal losses if any, and production is good. I give moms about a month off after raising a litter to crawlers.

We're up to 165 breeder females. Sifting through about 2 sets of litters (10 females) a cycle and holding back females is working great. I keep all the female holdbacks with the best moms to grow them up. The colony grows pretty quick this way. I've gone from 40 breeder females to 165 in less than a year. Losses are inevitable due to age, so I holdback more than i think I need.