Never knew that! Very interesting. I feel like kalmbachs henhouse chicken feed might be an option? I don’t know right off the top of my head but I thinks it’s supposed to be a feed that’s ingredients are pretty much raw, besides being dried. I’m going to see if I can find the ingredients list .
Corn, Soybean Meal, Roasted Soybeans, Oats, Wheat, Barley, Milo, Peas, Lentils, Sunflower Seeds, Wheat Middlings, Alfalfa Meal, Calcium Carbonate, Oyster Shells, Grit, Dried Whey, Dried Mealworms, Cane Molasses, and about a gazillion supplements...
https://www.kalmbachfeeds.com/sites/default/files/specs/T1117.pdf