I am new to the chicken world and am having trouble getting my sick Barred Rock, Gladys, well and am afraid my other chickens might be sick as well now. She is 1.5 years old and started having trouble months ago. Messy fluff and then feather loss below the tail...i initially thought other chickens (3) were pecking out the dirty feathers (or she was). Then a few weeks ago i noticed her losing feathers on her neck...too high for her to be pecking and i haven't noticed the other girls hassling her. Upon cleaning the coop i noticed MANY black & white feathers and realized she has down exposed in many places on her body. Her fluff is all gone and her skin in fairly red...no blood, though. She has been lethargic and less interested in food. I talked to my local feed store and put her on an antibiotic right away...Sulmet...and she did seem to perk up a bit. However, now i'm noticing what looks like undigested food (poo) in the coop under her roost and lots of it. I've given them all yogurt during the duration of meds, too. She still has red, upright comb, bright eyes and is doing pretty well otherwise. I'm still getting eggs, but i don't know if they are from her directly. I have another barred rock who is great (alpha) and two Rhode Island Reds who have ruffled feathers on their chest. I thought this was just from their roost, but now i'm noticing missing feathers in spots on their chest and around their legs...they otherwise seem totally fine. Gladys is really the only one who acts "sick". Besides helping me diagnose my poor girl...i was also wondering how long i need to wait before i can eat eggs again after medicating them w/ the Sulmet????? Anybody out there who can help a clueless girl in Eugene?? Thanks SOOOO much!!