You can leave the male in with the litter, mice are the ones who eat there babies. Sooner or later you'll have to come up with a rotaion so you breed just enough for your needs, if you don't you'll be overun with unwanted rats quickly. A low protein dog food will work since there might not be a rodent block available in your country.
I hope this helps
can you name me some brands of low protein dog foods? Purina, Science Plan, Pedigree, Eukanuba?