Don't know quite whats wrong,Two started to become still with a hunched back. Brought them inside ,hand fed and watered them gave them and the rest of the flock-Terramycin.The first one to go was panting heavy in the end. The second one lasted a few days longer and when she passed she had a grayish fluid discharge from her mouth. A third one was sick but seems to be getting better. Any help would be greatly accepted.

Thank-You

Rusty