My Rhode Island Reds are around 2 yrs old. They both look slightly "off" but one has tons of quills without feathers. One has a slightly curly comb. They do a mix of laying feed, oyster shell and free range in a pen. Son says poop looks normal. They appear normal behavior. They get fresh water every day. My son scoops out poop and changes bedding in coup regularly. I know nothing of chicken diseases and parasites.