Mazuri makes a mouse breeder diet that is i think 18% protien 9% fat. I use Mazuri 6F 50M30 Rodent Diet (rat ovals).



Some things to look out for when you use food not formulated for rodents is high levels of phosphorus. It causes kidney stones. Also antibiotics are common in pig foods and you don't want your healthy rats eating antibiotics (in quantities meant for pigs) or to feed your snakes rats loaded up with antibiotics.

IMO if you want to breed rats you should call around and find a feed store that sells purina products and have them order you some rat food.