Oh no I wouldn't alternate right away. I never breed rats back to back. The last time I bred rats I gave each mom several weeks off (3). Actually I'm even going to experiment with moving mice so that they can have time off from breeding as well. I don't like over breeding animals.

Didge is definitely putting some weight on her. I'm going to start looking for a male rat to start raising up, give her another month and then breed her.