Ah, that would be a good thing to check! Thanks. Unfortunately it's the only feed available locally though, so switching isn't really an option.
I'm good with an all-scratch ferment, I just want to know that I'm not shorting them on nutrition in the process, because they'll prefer the ferment to their dry feed. So what I'm mostly looking for is what grains & ratio to include in the ferment to get a decent protein/carb balance, and how much to limit that feed so that they'll eat enough of their dry crumble as well.
How about mixing the dry into the FF as you feed it? Make a mixed mash?