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Yes, chickens are capable of self choice to provide for their dietary needs. The part about refined grains makes no sense though. Chicken feed is cracked or milled grains, sometimes bagged as cracked grain, sometimes milled, mixed, and pressed into pellets, but these feeds are still comprised of all the parts of "whole grain".
It is typically in human food that grains are separated into parts for different uses. For example wheat can be separated into bran, germ, and endosperm. The endosperm is ground into white flour. Bran and germ are used in other products. Why? Because white flour keeps on the shelf longer. Whole grain flour turns rancid because of the fat in the germ. It's the same with corn, we break it down into many different products that are used in all kinds of foods and consumer products, but the rolled, cracked, milled corn we give our chickens is still comprised of the whole thing with nothing removed.
Yes, chickens are capable of self choice to provide for their dietary needs. The part about refined grains makes no sense though. Chicken feed is cracked or milled grains, sometimes bagged as cracked grain, sometimes milled, mixed, and pressed into pellets, but these feeds are still comprised of all the parts of "whole grain".
It is typically in human food that grains are separated into parts for different uses. For example wheat can be separated into bran, germ, and endosperm. The endosperm is ground into white flour. Bran and germ are used in other products. Why? Because white flour keeps on the shelf longer. Whole grain flour turns rancid because of the fat in the germ. It's the same with corn, we break it down into many different products that are used in all kinds of foods and consumer products, but the rolled, cracked, milled corn we give our chickens is still comprised of the whole thing with nothing removed.