I just leave all of them together and when I see a female ready to pop, I put her in a seperate tank. I let her raise the babies, wean them, then give her a little break before re-introducing her to the group again. I am doing the same with my rats. I heard you can leave ASFs together and they usually dont eat babies so I will find out if this is true or not. One of my ASFs just had ~15 from what I can count and she is with another pregnant female right now. The male had to be removed 2 weeks ago though because the females ripped half of his face off. He is recovering nicely