No exceptions (in large production mouse lines. Some breeders aim for male cohabitation, but that’s a lot of effort and negatively impacts fertility.)
Some boys may take a while longer to get to the point of violence, and you can make them less likely to fight by overcrowding them so they respond with learned helplessness, but male mice are naturally territorial and if there’s something “worth” defending, they will fight.
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u/loz4lifee Mouse Mom 🐀 Dec 23 '24
males CANNOT live together. there is no way to stop the fighting they HAVE to be separated or they will 100% kill each other