The fat content is not high enough to provide adequate levels for a gestating/lactating rat or a mouse. The hog feed I get for my mice has a higher fat content than that.

I honestly would not use it just because of the significantly low fat content. They need at least 6%, if not 9% fat. I was using the 6F Mazuri on my pet rats (30 of them) and they started to look like crap. Very rough and not holding their weights. I switched to 9F, which is 16% protein and 9% fat and they are completely different. They look alot better and don't have to eat as much.