Yesterday I went to my feed store and I looked through all the feed they had, but the only stuff they had that had over 16-17% protein was the meat bird crumbs. (20%) I bought some but I was wondering if I could feed it or maybe mix it in the food they have.
Personally, I would mix it with the layer feed you have now.
If you have a photo of the bag or tag of the meat bird feed that would be great. Also, did you happen to check the date to see if it was fairly fresh.