Niacin question

I feed All Flock which has extra niacin in it and then "treats" of canned peas or frozen home grown green beans. Did have one of the 25 still end up with turned out wings. BUT makes it easy for me in picking who gets to go to freezer camp.
 
As adults, do ducks need niacin supplements everyday? I understand as they are growing they need it daily... but I'm wondering if they still need it as adults?
This link and Metzer Farms say that adult ducks need a feed that contains 55 ppm niacin, so as long as your feed has that, then no need to add niacin, but since chickens only need 10 ppm, it's probably fair to assume that the average chicken food does not meet the niacin requirements of ducks.
http://www.merckvetmanual.com/poult...t-poultry/nutritional-requirements-of-poultry
 

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