Whats the reasoning behind the lower protein formula, I have been giving mine SPORTMIX 33% protein dog food they all seem to love it along with corn sunflower seeds and collard greens however also its about breeding season for the first time so maybe I need to switch to some other stuff I don't know this is all new to me as well, I never intended on owning peas but they just moved in one day and took over. They r free range in summer and hide out in my garage in the winter or any severe rain storm they run and fast into the garage.
The protein level of the feed you are feeding is not that high. If you would weigh out every feed you are providing by protein level it is very low. Example one part feed at 30%, one part feed at 20% and one part feed at 10% = 60 dived by three equals 20% total proteins. Scratch grains are at about 8%, oats is 12% but fresh vegs are harder to evaluate and can be much lower than even scratch grains.