Niacin question

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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