I LOVE when new ducklings pictures are posted!!!! So cute! I don't know what to tell you about the drake limping. If he's the only one limping and you already added niacin, I don't know. How do his feet look? Do his legs seem to have any sensitive spots? I'm just thinking about what I do to check my dog when she's limping.
They all have been limping. But with the other ones it just stopped. With the little drake it keeps coming back from time to time. At this moment he`s walking normal again. Maybe it`s because he`s so big and heavy? He`s almost twice the size.