I have rats and mice that deliver 15 regularly and do fine with them.
I find the infantcide/mortality is higher when
1. there are two many adults / juvis in the tub
2. new adult introductions
3. if it is the female's first or second litter
4. inadequate food and water is provided
Other than that you should be fine, and even if you lose a few... not so bad to have a litter of 12 or more.
You may consider holding back a few of those daughters as well.
Bruce
PS: one other thing to note, I get a higher survival rate as well if I have an experienced female in with a female that is delivering her first litter.
I think rodents, will mimic the correct behaviour (teaching the new female appropriate maternal behaviour till the instincts kick in fully). I have females routinely that are not nursing that will tend to a new brood. But then again, the act of stimulation likely does trigger the bio feedback loop for non-lactating females and induce lactation. And it is not like many of them ever really stop lactating if you have a group that has staggered births and they are aunting off the litters.
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