When I read this, I got this mental picture of antibiotic molecules, decked out in military gear— combat helmets & all— marching in formation... hep, hep, hep, hight, hep..... heading off to battle infection...
But seriously, droy covered some really good points. Bluekote may yet be useful, but if you are going to the vet tomorrow , hold off using it until then.
Is the infected wound from the bite? Or did the bone puncture the skin? If it’s right where the break is, then you probably can’t say for sure which came first, the bite or the break....
If the broken end of the bone came thru the skin, or even if the break is just visible thru the wound... That is
much more serious, and the duck will 100% need heavy doses of injectable antibiotics— a whole
regiment of them! Or at least a
regimen. Someone else will have to chime in with what works best for bone involvement. You’re going to want something
very broad-spectrum.
If the wound goes into the muscle or if it just pulled the fascia (skin) away from the muscle, you need to flush that every day with
BETADINE (Should be able to find it at any drug store or Walmart) diluted in enough cooled,
boiled water to make a solution that resembles strong tea. After flushing, squirt some polysporin/neosporin/bacitracin- type ointment down into the hole, cover with gauze, and wrap the wing secured to the body as previously described. You want to make sure the bones are as close to being in the correct position, lined up, as possible before wrapping. You might need to use tongue-depressors, or something similar to sandwich the wing and keep it still.
Wrap the splint in place leaving yourself a way to still get to the wound to flush it if at all possible.
Btw, a single layer of vet-wrap over the feathers will let you use tape to hold things steadier without worrying how to get it back off without trauma.
Good luck!