If you can get the ducklings that are having problems to consume a whole tablespoon of this by themselves they are only getting 31 mgs of extra niacin. If they are having problems they should be getting closer to 100 mg of niacin extra a day as I understand it. That means 4 tablespoon per duckling per day that you have to make sure they get with this vitamin. The cattle vitamin that
@Miss Lydia is recommending has 100mg in 1ml and the bottle contains 250 ml. It is much easier to get into the ducklings a lesser dose than 4 .5 oz doses or 2 oz a day.