I am lucky that living in a rural area we do have a feed mill that custom blends our feed. I can have what I want put in it and it is cheaper than bagged store feed. The original mill we bought from had a nutritionist (they supplied a large egg facility) and he helped us develop our recipe fitting for gamebirds. When that mill shut down we took the recipe to another mill a little further away and they were happy to supply us - we order 1000# at a time. They now have several people in the area using the same mix.