Hi
@Reneanana
So sorry this has happened to your duck. I have managed ducks with some terrible wounds from predator attacks but not a neck wound like this. But let's start at the beginning
The wound is full thickness skin and subcutaneous tissue exposing what is likely to be the esophagus. The bubble may be the dilatation of the esophagus for the crop ( the crop isn't a separate structure in ducks.)
You have cleaned the wound with saline and offered water and electrolytes to drink.
I often wash out wounds with plain water, and then once any obvious debris is washed away, use saline.
I would spray the wound and bubble with Kote Blue now, and as you have already been advised soak a cloth in saline and put it over the wound to keep the bubble moist. You might use Vet Wrap to hold the wet cloth in place. Just wrap it gently not tight.
An alternative to Kote Blue is Vetericyn spray.
While you duck is not eating, it is important to get some calories into her as well as electrolytes. I use pedialyte and add Rooster Booster Poultry Cell to the pedialyte. An alternative to pedialyte is Liquid IV sports hydration solution BUT be sure to get the sort with glucose/dextrose and NOT the formulation that is sugar free and contains sugar substitutes. The sugar substitutes are harmful to ducks and the whole purpose of using the solution is to get some sugar/dextrose calories into your duck.
You have to encourage her to drink frequently--every 15 minutes dipping her bill into a water container with your rehydration solution and Poultry Cell vitamins.
Keep her warm and quiet in a reduced light environment. I have pet carriers for my duck emergency room (my bathroom) but while she is so sick, an open cardboard box will suffice as she isn't going to try and get out. Lie her on a puppy pad.
I keep Baytril 10% in my ducky first aid kit for emergencies like this. It's generally only available with a prescription from a vet. But as you don't have a vet available, buy it on line from Allbirdproducts.com If you can afford to, pay for the expedited mail service as it could be week by regular mail. It comes with a small oral syringe for treating your duck.
I'll look up the dose and get back to you on that.
The treatment plan is to keep the wound clean and let it heal on its own. I have been amazed how quickly ducks' wounds close up when kept free of infection, and the duck is kept calm with movement confined until they are well on the way to healing.
You will need to open the cloth every day, and if there is any sign of infection -- discharge, obvious pus, offensive smell, again wash out with saline. If you need to wash with saline, you should respray with Kote Blue or Vetericyn, then re-cover with a clean cloth soaked in saline.
The duck also needs to eat as soon as possible. Once she is taking your oral rehydration solution, make her some ducky soup. Dissolve some pellets or crumbles in warm water and make a very runny gruel-like mixture. Offer the ducky soup luke-warm, every hour once she takes a little.
Good luck with this . Keep us up dated