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Be sure to check the formulation of the feed. You want a high percentage protein (20%+ is my preferance).
I've read numerous reports of people who have switched to lab blocks and the mothers started eating their young.
I use a dye free dog food for my mouse colony with 21% protein. Fifty pounds for $10. Despite the claims of a few, there is absolutely nothing wrong with that, and far more mouse breeders than most realize use it as well.
My mice rarely have litters of less than a dozen and 18 is not uncommon. No problems with eating of the young either.
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