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What WoodlandWoman said... 1/4 to 1/3 pound per bird is the average consumption but also depends on treats, free-ranging, location, and time of year. More feed during cold weather (you could lower the protein %) and less food during hot weather (you could up the protein %). Colder weather requires more carbohydrates to "burn" for warmth, in warmer weather actually less is eaten but they still need protein (thus raising the protein % might be a good idea). Cracked corn is good in the winter for "warming them up" but might actually cause them to overheat in the summer...high in carbs but low in protein. They're more active in warm weather and usually lay more eggs and need more protein.
Most people recommend to free feed while others feed a specific amount. You'll have to decide on your own method and what works for your birds. As someone mentioned, if that was the only "overweight" bird that you had then probably it had a genetic/health issue.
Best wishes,
Ed