Get some live crickets, bait shop or wild ones . Sit down and release a few, hold one by its legs ,they love crickets. Once they eat a few,they will come to your hand to get them. It might take a few times ,but be patient.Hope this helps.
I had similar problem, have 2 ruens,2 cayuga, and younger crested ducks. I seperated the ruens from the rest, for 2 nights. That solved the problem, when i put them all together there was no more ruens picking on crested ducks. I hope this might help.
They are on the Purena chick feed ,do not remember exact name.The other ducklings are fine,you mentined Niacin. What is it and what form do you feed it? I thank very much for your response.
We have a 5 week old Cayuga duck, it walks stiff legged. He is skinny,but gets around well.Any thoughts as to his problem,when we got him he seemed find ? My wife says he is a special needs duck! Thank you