So of course my feed store which I ordered duck starter at said truck came in with no duck starter.....I know they'd be ok on chick starter for a few days but I do have catfish pellets and I was thinking about feeding half and half to come close to a 21% ratio. Going to go by the other feed store later today that I know has game(but its sometimes sold out). My question on the niacin supplement though is I've done plenty of reading and want to give it. I know I can give leafy greens with grit but I have a ton of "fleischmann's bread machine instant yeast" because my husband loves to make pizzas from scratch and biscuits. Ingredients are listed as yeast, sorbitan monostearate, and ascorbic acid(which I believe I ready would contain the niacin?). Can i use that and approximately how much should I sprinkle on food for 23 ducklings?