I have six baby ducks coming next week. Three Blue Swedish and three Khaki Campbells, one male and two females of each. Everything I read says to feed them chick starter feed which I have plenty of since I also have 25 3 week old hens brooding. BUT it says to mix it as a mash (add water to the feed) and to add either niacin or brewers yeast since they need the extra vitamins for bone development. I live in a little town far removed from any health food store. One lady here said to just use regular Hellmans yeast, that it was the same. Also, the local pharmacy does have niacin tabs. Can they be ground up and used? Help!!! Do I need to make a trip in to the bigger city to get actual Brewers Yeast?