I’ve been adding nutritional yeast on my Ducks feed, even though my ducks are all different ages. I have some that are four months old and some that are 10 years old and all ages in between so I put a couple tablespoons into each giant bowl of feed (21 ducks)Sorry I have been remiss to update this. They are fine now. We keep doing what we're doing, just not quite as often, but they get Poultry Cell in their water once a week as well as nutritional yeast. I just sprinkle about a teaspoon over their feed about every other day.
I think they like the taste of it too and so do I actually
The only thing I don’t like about, it is in the heat of summer when there are flies around the flies are attracted to the nutritional yeast in the food.
I’ve been feeding my ducks and geese, the Kalmbach duck and goose feed as free choice And also mazuri Waterfowl maintenance into their water buckets in the evening it floats on top of the water and they love it so much they all run over and gobble it right up before bed. It gets them near their house too, so they’re set up to go to bed.