I said 200 mgs A since the duck is 10 weeks old. I'd start he on some asap. get plain niacin crush the tablet up as good as you can add to 1 gal of water mix again real good and put into what ever your using for her waterer.Wait. Did the shot include niacin, or was it a B12 shot?
Has she been given any niacin? Since that is so linked to neurological development, I would get 150 mg in each gallon of drinking water to her starting right now, and do this for 6 to 8 weeks.
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