Well, I can tell you what answer I'd give if it were a chicken, and I suspect it's going to be the same situation. Chickens are extremely sensitive to "caine" drugs, which can kill them. Some wound cleansers and antibiotic ointments contain these and should not be used. Examples are cetacaine, benzocaine -- anything ending in "caine." I think this applies to any bird, but am really not sure. Other than that, simple human first aid is fine. You might clean with simple soap and water, or peroxide or Betadine for the initial cleaning. A little Neosporin or whatever you keep around is good. A dressing usually isn't practical, but if you really have to, duct tape will hold gauze in place (for a while) and will stick to feathers. With chickens you will probably need to separate the bird til the blood is no longer visible. Another approach, which I've used on smaller wounds, is just to clean then spray or dab with BluKote. This masks the blood and is also an antiseptic. My "BluKote" is generic -- active ingredient is gentian violet, an old timey remedy.