MannaPro food question

[Soon2BChixMom]

I am currently feeding the same food to my week old ducklings. Brewers yeast is not listed as an ingredient and I can’t find anything about Niacin on the bag so I am adding yeast to it. Besides, I am not completely sure I trust this brand. I recently switched my adult ducks to their duck layer feed. My ducks are doing great on it but look at the picture on the bag.
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I’m not sure they know which gender lays the eggs.

I would contact the manufacturer. I contacted purina and they responded in like 3 days.

 

[Soon2BChixMom]

This is a screenshot of the mannapro layer. There is a niacin supplement added, if you want to know the amount, I would contact the manufacturer.
I am using flock raiser since I also have chickens. But, had a question on the amount of niacin and Purina answered my question within 3 days.