Hi there from Washington!

Hello, and welcome to BYC.
Purina flock Raiser was formulated by feed formulators and nutritionists to meet the desired nutrients most young poultry need. 20% is near the recommended protein content we would want for ducklings, and is not too high.
For a complete chart of nutritional requirements for ducks you can check out the link below:
https://www.metzerfarms.com/NutritionalRequirements.cfm
https://www.purinamills.com/chicken-feed/products/detail/purina-flock-raiser-crumbles

Calls do not require as much niacin as other breeds, so the niacin content in the feed should suffice. Adding extra niacin into their diet, however, would not be a bad idea.
 

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