One problem with hairless rats (recessive), is that the females often have issues producing milk. And the pups don't have a great survival rate due to starvation.
It's best to have furred lactating foster moms with hairless moms to help them out.
If they are double rex, then there is nothing to worry about. They lactate fine.
It is true that nails and fur are not digestible, however, they clean the inner tubes of the predator.
In the end, it doesn't really matter if you feed a furred rat or a hairless.
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