I have a small flock of chickens, 7, that I am going to try to keep over winter. My husband farms and grows soybeans, some corn, and wheat. He gave me several large seed bags full of soybeans and corn to feed the chickens over winter. I have read all about needing to boil soybeans before feeding them and that is not a problem. But what is cracked corn? can I just take the corn and crush it with a hammer? Also do I need to supplement with anything else?