I have noticed that several of my hens feel too thin. Their keel bone is pointed and protruding more than what feels normal. I have realized this seems to be happening to the girls that rank at the bottom of the pecking order. Is it possible that they are not getting to eat due to being lower ranked? I keep the 25 pound feeder full at all times and they also free range. They do tend to empty the feeder by digging the food out while eating, but I have something to catch the lost food so all I do is pour it back in the top. Might I need to get a second feeder? I only have 19 birds.