Niacin defiency in ducks?

[Merylyn]

What are the sympton of niacan defiency in ducks? And how long till supplements begin to take affect?

 

[Isaac 0]

Hi, @Merylyn .

Have you read this thread?

https://www.backyardchickens.com/threads/niacin-deficiency-in-waterfowl.1367557/