Questions about breeding rats

[meowmeowkazoo]

also you wont want to put two breeding males in together cause they will fight to the death once a female comes into heat

This is false. Sometimes two males will fight, but it's just to establish dominance. A trick that I use once in a while with females that are reluctant breeders is to place the female in with two males. The males typically get along after the initial fighting, and the female being in heat has nothing to do with their aggression toward one another.