I've had a few sick birds this past month and they all have died. The symptoms start out with trouble walking and poor balance. Then the little guys can't sit down properly and continue to fall over. Their legs completely shut down and kind of lock up. At the last stages, they will have one eye closed and die shortly after that. The whole process takes 5-14 days. I've checked them for parasites and have found none. It was suggested that they may have a worm problem so I've administered Ivomec to the whole flock (could not locate Valbazen) yet still have chickens getting sick. Anyone run into this same problem? My babies are about 5 months old. Thanks for the help!