Culled a chick last night . It was a little rooster. I had noticed sense he started feathering out his feathers have always looked to be in disarray (sticking up and some looked to be upside down) He has always been one of the smaller, slower developing chicks as well and has always been a little clumsy. I noticed about two days ago that he wasn't walking right (more then normal) and was stumbling. Then last night he looked to be either panting or trying to squawk but there was no sound coming out, he kept falling over and seemed to be extremely unbalanced. He was still eating and drinking though. I have more then enough chicks and wasnt going to spend time nursing a runt rooster back to health when there was a chance he either wouldn't make it or would take twice as long as the others to fatten up for butcher. So, I had the hubby take him outside and give him a swift end. I know it sounds cold, but I would prefer him to die quickly then suffer. Did he have something developmentally wrong or was it a disease? Should I put the rest of my chicks on antibiotics, even though they seem perfectly healthy? PS I checked for mites, none of the chicks have any.