I had a hen with a big wound like that, I also found some puncture wounds about her belly and neck, (she was attacked by a dog) I kept her in a dog crate in the garage till her feathers started growing back. Cleaned it and applied the ointment daily, and she healed completely. I did give her antibiotics in her water for about 7 days too. After about a week, I think she was ready to go back with the others, but there was no way that wound was ready. I knew the others would pick and a dust bath would have been awful. Take care.