Unnecessary if you have a good colony the average is 6 to 12 babies, I average 12 to 15 above that you would run in the issue of the female not being able to nurse them all, the keys are: having a strong colony to start with or build your way to it, selective breeding, proper sex ratio in the tub, early retirement especially for harem style breeding, and proper food.

I have been breeding feeders for a decade and I produce several thousands each year without any supplements.