One of my seemingly healthy females died in pregnancy a few weeks ago. I suspect it was because I was using dog food and it was her second litter. Babies born and nursed on moms with dog food also were not as healthy: slow growth, low weight and deaths. I have since switched to breeder rat/mouse diet from a feed shop and have seen a great increase in survival rate and overall health. If you're using dog food or anything but breeder rat/mouse specific feed I would highly recommed switching.
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