Aedryan - There is a very good Facebook group about breeding feeders of all sorts. Called Feeder Breeder Enthusiasts (shockingly minimal drama for a FB group, only 1 post in the 3 months I've been keeping up with it and admins shut it down pretty quickly.)
I'm far from an expert, but according to members on here, in that group, and the scientific community, rodents (rats and mice particularly) can be bred parent to offspring or sibling to sibling for many generations before hitting issues with inbreeding. It is a commonly used method to breed out negative traits, even, including biting, chewing, aggression, small litter size, etc. There are laboratory populations of rodents that have been closed populations (no new blood) for decades, although I forget which one(s) those were.
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