I just noticed today that one of my five Barred Rock hens, who was outside free-ranging, appears wobbly, though not so wobbly that she can't stand. She is still walking around, eating and acting like her normal self. I went outside to examine her and upon picking her up, felt that she was quite thin compared to her sisters. I feed my chickens layer feed, with sunflower seeds and scratch as daily treats. However, I'm beginning to wonder if they are consuming too much grain and if this would contribute to my hen's problems (though if that were the case I would have expected her to be overweight, rather than thin). She grew back all of her feathers from her molt several weeks ago and is not laying currently.