Maternity is not something animals learn. It is instinctive. Either they have it or they don't. I tried the "nice" way before, usually ended up with her never getting pregnant again or chewing up a baby or two or just living getting fat.
But hey, I could be wrong this time.
In my experience, I don't take the males out..I haven't noticed that it keeps any of the females from taking care of their kits (but then I have several females to a tub).