Some of my hens are quite thin, they seem to be feeling fine. I feed a complete layer crumble, with a separate feeder filled with crushed oyster shell and a medium grit, (I have the feeder separated with a partition) I have a mix of breeds-5 barred rock, 5 black star, 5 RIR's-these will be 2yrs in July, 15 ameraucana, 1 is a rooster-they will be 1 in May. The Ameraucanas are all a good weight. The girls that are thin are 1 barred rock, and two black star. I have watched to make sure that the more aggressive ameraucanas are not taking over the feed, but I see everyone eating together! I checked the thinnest two last night and they both had food in their crop, so they are eating. Some of them had mites last fall, they were hard to get rid of, but I think we are all clear now. Everyone was in good shape after that! I fed them oats to help regain some weight after they had mites and molted at about the same time...poor girls!!! I'm a little worried about feeding the oats along with their complete feed-kind of like offering the kids broccoli or ice cream, not to many broccoli takers! I add DE to their oyster shell and grit- could they possibly have worms? As always I need your help...Thank You to everyone that has helped me in the pastand who will be helping me now!!!