I bought a male and 2 females rats like 2 months ago to start breeding. One of the females is about ready to pop, she's huge. I've been watching and weighting the 2nd one but it hasn't changed at all. She hasn't gotten pregnant at all.

What do you guys do with non-productive or broken rats like that? I just euthenized it but I felt a little bad because she was a good girl, just wasn't helping me at all.