To be honest the is as may ways to feed a "Show Bird" is there brands of feed.
But I think the majority of the people that show poultry like to use a good game fowl feed that is higher in protein and mix a good grain or grain mix to that to lower the protein to there needs along with some supplements.
I seem to be doing well on a Game Bird feed mixed 80 /20 with a good pigeon grain mix then top dressing with some Calf Manna, Black Oil Sunflower Seeds and Hemp Seed..
The Pigeon Grain Mix I use is a 14% protein Maintenance 14% Protein - W/Corn (You can get Pigeon Grain with or without corn)
My Pigeon Grain Mix Contains:
Canada Peas, Milo, Whole Wheat, Small Yellow Corn, Safflower Seed, Maple Peas, Flax, Brown Rice, Vetch, Buckwheat, and Oat Groats.
And is:
Crude Protein (min) 14.0% Crude Fat (min) 2.0% Crude Fiber (max) 9.0%
When all is said and done the feed mix I feed ends up around 20 percent protein..
Chris