This 7month old Wyandotte cockerel started off with curled toes on both feet. Now after a couple of weeks he's much better but still walks in a kind of squat part of the time. Feet and legs look fine with no visible issues. His tore are no longer curled. He can straighten his legs and will sometimes but seems to quickly lose strength. He eats great and seems orherwise very healthy. What could be going on? He's on a 5% protein ration plus greens and occasional treats like a bit of bread or oats.