Yes with chickens we use collidial silver but we either didn't give enough to tjis duck or it doesn't work for egg peritonitis in ducks. She started shut down so took her to vets for baytril antibiotics. She's now standing and improving. Fingers crossed she makes full recovery 🙏🏻
Sorry for your loss. We are going through egg peritonitis with our muscovy. I'm thinking sepsis and wondered did you notice a change in the colour of Bill? At first mine was a blood spot appearing and now beak is blue. Feet are pale and eyes dirty pink