I have tried various ways in the past 9 years and the best one that works for me is to rotate my females remove them when pregnant, move them to an individual birthing tub and than move them them to a communal nursing tub when the babies are 5 to 7 days old, cuts down on the fighting and losses.
And of course it also prevent back to back breeding with females becoming pregnant hours after giving birth, that take it's toll pretty fast and litter are getting smaller as well as the babies.
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