I have 5 groups of 1 male 3 females......Very seldom do I seem to have more then one litter at a time, they seem to take turns? A couple times I will have 2/3 females pregnant but they are often at different stages. A good female is not always your best breeder....if you observe them I will always keep a non-producing female if she is a good caregiver....i notice that a lot in my groups that there seems to be one that gets pregnant less then the others but she seem to be a lead in the caregiving and nursing. Not sure if any of this made sense.

Observe the dynamics of the group and be careful not to feed off a female that doesnt produce as much as another, I have noticed that they seem to be better caregivers, this is not researched or based off scientific data lol