Thanks Joanna for your response. For the non-producing group I will try what you said about scenting the new male with dirty bedding, hopefully it will work. Waiting for a new colony to get of age and start breeding will take longer. I figured that it was probably a fertility issue because after over 2 months I shouldve seen something by now. And no I don't see chasing, I don't really much of any activity in their cage except for excessive feed chewing (have put in a wheel to help their boredom).

As for the other group with the dead male, I guess my only choice will be to keep one of the male babies already in there. Yea it will set back my production significantly as those females are very good producers. Do you think that the females will kill the baby that I leave in there? I ask this because I hear from some people that the females kill older pups if they aren't weaned quickly enough. Thanks!