Holding over and starting new groups is always a good idea, we rotate females out quite often and almost always have young holdovers to raise up for future breeding.
I'd blame the male in this case and replace him if you can, it's nice to have a dominate male but when he's forcing pregnant females to breed with him and bites them in the process then he's too aggressive and I'd pull him.
Young males tend to mind their manners better sometimes than older males
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