Peas (frozen, not canned), have a fair amount of niacin. In a pinch, maybe purée some thawed peas with water for ducklings.
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I started niacin the day I started this thread. I feel so guilty because it has been four years since I last raised baby ducks and I forgot to give her niacin. Does anyone know about how long before I might see results after starting niacin? She is otherwise very healthy and loveable.