I have a 19 week old yellow buff rooster that is in an inside pen and has started to walk funny, he is wobbly when he walks. His legs kinda bow out when he stands and he wobbles when he tries to walk. He has no breathing problems, eyes are clear, poop is normal, eats and drinks fine. The hens with him are fine, they are still on starter but i have started to mix some layer in there food. He has not been fighting and has no wounds. Any suggestions?