I have a 3 year old red sex link hen that has lost almost 2 pounds but is still eating plenty. Her keel is sticking out almost 3 inches from the rest of her body, and has all of her other bones protruding as well. I have tried deworming and electrolites and they are not helping. She has stopped laying eggs this spring so she isnt egg bound. There are no mites or bugs on her, or any of my other chickens. I found her sitting on the coop floor about 2 weeks ago so i isolated her into a kennel in the house. She is acting lethargic and not moving a lot. Her crop is always full, and whenever I feed her she seems ravenous. I had a 2 year old black sex link hen have all of the same symptoms last month and she died. I feed my chickens Purina layer cumble mixed with oyster shell, grit, corn, and scratch grains, as well as letting them free range daily and giving them fruit and vegtable scraps. None of my other chickens are seeming to have any problems. Does anyone have any thoughts on what this may be?