2 litters in one tub bad idea?

[grrmisfit]

We do ASFs in 1.3 groups and dont have many loses of pinks, aside from stillborns. The mothers will seperate the larger young usually and they take turns nursing. You do have to be wary though to wean them off at the appropriate age. The offspring of the mother needs to be weaned out before she drops another litter. Having two litters in the same cage from a single mother is too much and messes up the balance of females to offspring.

weaning is at about 3 weeks? and then i move them to their own tub. the question I have about that is what do you do when the females in the juvi tub start getting pregnant? do you move them over to old tub or just keep making new juvi tubs?