My chickens have lost some weight now that there's less day light and it's getting colder. There's less time to eat. They are cold! Everytime I hold them, I hold them close to help keep them warm. It isn't that cold, but now there's a heat lamp in the coop. Anywho, the only organic cracked corn is in 50 pound bags. Do you think 3 chickens can go through that during winter? Do I mix it in with their food, or JUST give them cracked corn?