The other day I came home and one of our pullets (15 weeks old) was missing all her back feathers. We figured one of the older hens was picking on her. We cleaned her up but then two days later she became wobbly on her feet. Her feet look fine. Today when I got home she was laying down and could hardly stand. She seems to be able to squat for a little bit but her legs seem weak. I did give her first dose of B1 liquid and separated her. Any idea what’s going on? I’m thinking and hoping that it’s a B1 deficiency but not sure.