What are your thoughts on keeping mice together all the way through pregnancy, and then still keeping the baby's in with the rest of the colony?

I know how the male can eat them if they are not his, and that others can stress her out, but while i was at the pet store yesterday i saw that one of the moms was kept in the tank with all the other feeders( around 25) and the baby's had color, so they must have been in there for a few days. I want to try it but i want to know if anyone has any high success stories using this method. I do not mind separating them, but introducing new mice to my colony is hard work!