You can just feed them the duckling feed and not add any niacin Or you can be proactive and use the niacin to keep a niacin deficiency from happening. A lot of times even using niacin they can still come down with a deficiency, Maybe they aren't utilizing the niacin in their feed but also after...
Some say it can cause angel wing. When I first started with duckling I fed Purina Flock Raiser crumble all the feed store sold in 2004 was Purina (small town) it’s 22 % I believe I started my ducklings on it and that’s what they ate all their lives never had angel wing in any. Also gave them...
They always need a container deep enough to be able to dunk their heads to keep their eyes and nares clean. And to keep them from choking when eating.
I made a waterer like this to keep mine from climbing inside but they can still dunk their heads.
I would use something like Nutritional yeast...