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This is if they are on a commercial 15-16% pelleted or crumble feed and kept in confinement. It will be higher if your feed is lower in nutrition, lower if your feed is higher in nutrition. (They have to eat more to meet their needs if the feed has less nutrients) If they are free-ranging on land that has plenty of things to eat, and they are birds that are inclined to feed themselves, they will eat less bagged feed, potentially none when the weather is good. In winter, there is usually less to eat, and they will eat more bagged feed. If they are lazy and don't feel like foraging, they will sit around eating bagged feed, and will eat more than a bird that likes to run around and hunt for food.