I've had a boy and girl rat together in the same cage for maybe 5 months now.
And for some odd reason I cannot get them to give me any babies!
I have done this before but I only put the guy in for maybe two weeks and then took him out, but this time I've left the guy in until I see mom starting to get fat, then I will remove him, but the magic just ain't happening??

Any suggestions?? I'd say they are both the same age, 6 months or more.

They are also getting big now and the boy is starting to outgrow the mom, so I'm worried that when they get into fights she is gonna get hurt sometime soon!