I learned recently that an adult chicken eats 1/3 pound of feed a day. I calculated that for my 9 chickens and that a bag would last us about 11 days (the bags is about 35 pounds). A bag actually lasts me about 3 weeks. My question is, does a chicken eat 1/3 of a pound each day if the chicken doesn't get anything else to eat? What about chickens that are in the yard and eat grass and bugs? Do they still need 1/3 pound feed per chicken each day, or would the grass and plants they eat supply some of that requirement for food? Do some people just rely on grass and bugs as the chickens primary source of food? And if so, do they skip the feed altogether? I seemed to be confused on this. Thanks for all the help here.