I have a 4 month old Jersey Giant who seems to have lost weight and her feathers near her rear are curling. She eats regular chicken feed made by Brookhurst, always has access to clean water, and sometimes eats lettuce from my garden when out of the coop. I noticed her feathers curling about a month ago and the smaller body yesterday when I picked her up to look at her feathers. The feed store owner that I bought her from said she would be a lot larger than the rest of my hens; 2 Buff Orpingtons, 1 Rhode Island Red, and 1 Brown Leghorn; but so far she is about the same size (same age as the Orps and RIR). Her body actually feels smaller (under the feathers) than the Orps, the feathers make her look about the same size otherwise. I've been finding quite a few large black feathers in the coop each day also, that doesn't happen with my other girls. Can anyone tell me what might be wrong? Here are some pics of her.