let me see if i got this right..

[lord jackel]

I have a snake that will eventually be eating rats in a short amount of time.. what confuses me is.. why cant u leave the male in with the females when they have their babies?? or is it just a preference for some rat breeders...

You can...the risk is that the female will more than likely get pregnant immediately after giving birth...so the risk is your will burn her out quickly. By seperating the male you give the female the most time to recoop and therefore produce more and for a longer period of time.