You can. I gave chicks fermented barley and wheat along with their laying mash this past spring. You can ferment just about any grain, so you can pretty much choose those you would like. Here's a list of things by protein percentages:
FOOD SOURCE - PROTEIN BY WEIGHT
Dried fish flakes 76
Dried liver 76
Dried earthworms 76
Duckweed 50
Torula yeast 50
Brewers yeast 39
Soybeans (dry roasted) 37
Flaxseed 37
Alfalfa seed 35
Beef, lean 28
Earthworms 28
Fish 28
Wheat germ 25
Peas & Beans, dried 24.5
Sesame seed 19.3
Soybeans (boiled) 17
Sunflower seeds 17
Wheat bran 16.6
Oats, whole 14
Rice polish 12.8
Rye 12.5
Wheat 12.5
Barley 12.3
Oats 12
Corn 9
Millet 9
Milo 9
Rice, brown 7.5
Happy fermenting!
FOOD SOURCE - PROTEIN BY WEIGHT
Dried fish flakes 76
Dried liver 76
Dried earthworms 76
Duckweed 50
Torula yeast 50
Brewers yeast 39
Soybeans (dry roasted) 37
Flaxseed 37
Alfalfa seed 35
Beef, lean 28
Earthworms 28
Fish 28
Wheat germ 25
Peas & Beans, dried 24.5
Sesame seed 19.3
Soybeans (boiled) 17
Sunflower seeds 17
Wheat bran 16.6
Oats, whole 14
Rice polish 12.8
Rye 12.5
Wheat 12.5
Barley 12.3
Oats 12
Corn 9
Millet 9
Milo 9
Rice, brown 7.5
Happy fermenting!