Well each duckling is different
Some don’t need extra and do fine
Others need it
They can be from the same parents
Durvet vitamin B complex is best
1ml over small treat or directly
Adding ti water dilutes it to much and then they don’t get the full dose needed
But she is smaller so the dose would be less
@Miss Lydia maybe able to share the link on dosing
It says injectable for cattle on the bottle but it’s oral for birds
Many of us give this at any sign of leg issue even if it wasn’t niacin
Just had a duck this winter sprain her leg slipping on ice is my guess
I gave the B as well as Medicam and she healed quickly
I also give my babies 1tbs nutritional yeast over 1cup feed ( every feed )
I do this for 12 weeks. Then a few times a week sprinkled in after that
In winter I gave it daily and some of my birds are 2 years old
I haven’t yet ( knock on wood ) had any niacin issues
I may give more then needed but it won’t hurt them as they flush out any they don’t need
It’s better to give good preventing measures then end up with it