I'm new to the site but I hope someone can help me. This is my first flock and I have one sick hen and one who has passed on. Both have no respiratory symptoms, the one still alive is letharthgic and laying thin shelled egges but otherwise appears healthy. The hen that died had layed thin-shelled eggs almost since she began laying but appeared otherwise healthy till recently. ( she was about a year old) She recently became lethargic, isolated herself, her comb became shrunken and purple and she had pasty white and yellow diahrea. Neither chickens had any foul odor, I am completely clueless as to what could be the cause. I would like to treat Lady holistically if possible. I have her isolated and switched her back to grower feed since it is medicated. I also but a tablespoon of apple cider vinegar in her water. I read online this can cure up many illnesses in chickens. Please offer your advise, my vet. is clueless too as she never deals with chickens, but we both agreed it sounds like something long term since i treated the bad-layer with proper diet and nutrition for a year with no results.