I would save some of his daughters and raise them up to see if any of them keep his calmness, then get rid of the nippy mothers and breed him back to the daughters. Ultimately you'll end up with all calm, friendly ones.
I used this method when I raised mice and rats. As soon as one of them bit, they were designated as feeders. Eventually, everybody was nice and I could handle all of them with no problems. I even had young feeder rats that I didn't handle but once a week to move them to clean cages, and they were friendly and curious, and would have no problem being pets.
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