Owen,
Based on my experience and others who have bought ducklings from me, I would NOT recommend DUMOR brand anything.
I fed it to my ducklings last year and have 60% of them develop leg issues (as stated above, they do not put enough niacin in it which contributes to leg and foot health.)
I switched to Poulin brand as soon as I noticed the leg problems. Within a week, every single duckling was back to normal.
And based on what others have told me, they had the same problem. I had one woman buy 6 WH ducklings, 1 week old. She fed DUMOR for 2 weeks and 4 started to lay down a lot, act weak in the legs. I told her to switch immediately and she saw an improvement after 4 days on a new brand.
I hope this helps. Just be sure that whatever brand you use, make sure it is unmedicated.