I'm trying to get into rats for breeding and was wondering about their size when they are ready to breed. I did read about females being no younger than 4 to 5 months and no later than 9 months for their first breeding, but since it's been awhile since I've had rats as pets I wasn't sure about how big they are at 4 to 5 months.
I see at Petco the tanks filled with small, medium, and large rats but the employees really couldn't tell me their age. Another reason why I won't buy them from there. lol

So if anyone could help me out that would be great.

Thanks!

April