Need some help....

I had two female mice in with one male and today I noticed that one of the females had two sores/wounds on her back - nothing to serious but I didn't know if the male did this to her while mating or if the other female attacked her. Your thoughts please.

Probably the other female attacked her. Takes a while to get a good mixture of mice sometimes..

I removed her to avoid any further problems.

Thanks for letting me know what probably happened. I am new to this breeding thing but sure am enjoying all the little babies.:):)

Forgot to ask,...... should I feed off the female that attacked her - would this mean that she wouldn't be a good future mother??

You can try her again. Maybe with different cagemates.
It's up to you.