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I just got the liquid b complex from Tractor Supply. Do you know what the dosage should be. He weighs 6 pounds.When one has full-blown niacin deficiency the liquid b complex is the best and fast way to treat it.
I can give you info on Brewers yeast compared to Nutritional yeast and info on niacin deficiency and how to treat it.
Since he isn't eating very much best to give the liquid B complex {TSC} to him orally
https://www.backyardchickens.com/threads/nutritional-yeast-vs-brewers-yeast.1393856/
https://www.backyardchickens.com/threads/niacin-deficiency-in-waterfowl.1367557/
Hopefully you can get him on the liquid B complex today and start seeing improvements by mid week. Keep us updated.
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1ml daily. Here is info on giving orally. If he isn’t eating this is the best way to give it. You want him to get full dose and putting it in water dilutes it to much. https://www.backyardchickens.com/articles/safely-administering-oral-medications-to-all-poultry-and-waterfowl.73335
He is the same but got him the vitamin B complex and administered it orally. He was not happy about it. But it encouraged him to drink water and eat a bit of tuna i puréed for him. Hoping we start to see an improvement. I know it may be slow but I will take what I can get. He is such a sweet boy. I hate seeing him like this while all of my other ducks are thriving.How is the duck today ?