I have a small colony of rats. 1 male & 4 females. The 2 solid white females have had 1 litter each with my male, but that was back in March. Now they won't breed again. The other 2 females are still virgins. They're all old enough too. But since the temps have risen, they seem to have stopped. I have them in a small bedroom without any a/c. It gets into the 80's. Is that too warm? Thanks!