I just kept feeders filled for mine and let them eat for 12 hours after the 2nd week. How much they ate I don't know as I didn't keep track of the feed consumed. I had a pen of 25 and when a 50 lb bag of 18% was over half gone I would just buy another one. At the normal butchering age I switched them to layer feed and give just enough to maintain them and they get to free range during the day.
Hens go broody when you don’t want them to… and won’t go broody when you do. 