Just a thought but I wonder if you could use this stuff. I used to hand feed cockatiels and the protein content is 22%
http://www.petsmart.com/product/index.jsp?productId=2753607
It does say for ALL birds so why not chickens?
Here is the content
Ingredients: Ground Corn, Corn Gluten Meal, Ground Oat Groats, Ground Wheat, Wheat Middlings, Corn Oil, Dried Whole Egg, Soy Protein Isolate, Dried Beet Pulp, Dicalcium Phosphate, Calcium Carbonate, L-Lysine, Wheat Germ Meal, Brewers Dried Yeast, Corn Sugar, Vitamin A Supplement, Salt, Choline Chloride, DL-Methionine, Potassium Chloride, Propionic Acid (a preservative), Vitamin E Supplement, Vitamin B12 Supplement, Riboflavin Supplement, Ferrous Carbonate, Zinc Oxide, Ascorbic Acid, Ethoxyquin (a preservative), Manganous Oxide, Menadione Sodium Bisulfite Complex (source of vitamin K), Niacin, Calcium Pantothenate, Thiamine Mononitrate, Copper Oxide, D-Activated Animal Sterol (source of vitamin D3), Pyridoxine Hydrochloride, Folic Acid, Dried A. oryzae Fermentation Extract, Dried Bacillus subtilis Fermentation Extract, Beta-Carotene, Dried Bacillus coagulans Fermentation Product, Dried Bacillus licheniformis Fermentation Product, Dried Bacillus subtilis Fermentation Product, Dried Whey, Cobalt Carbonate, Calcium Iodate, Biotin, Sodium Selenite.
Guaranteed Analysis:
Crude Protein (min.)....22.0%
Crude Fat (min.)...........9.0%
Crude Fiber (max.).......5.0%
Moisture (max.)..........10.0%
Protease (min.)............0.2CSU (1)/gram
Amylase (min.)............0.4SLU (2)/gram
Total Bacillus Species ..250,000 CFU (4)/gram
(1) CSU - Casein Solubilization Units
(2) SLU - Starch Liquefying Units
(3) B. coagulans, B. licheniformis, B. subtilis
(4) CFU - Colony Forming Units
Size: 18 oz or 5lbs