I feed nutritional yeast 1tbs to 1cup feed till 10-12 weeks
I use chicken starter then switch to grower by 3 weeks and my ducks stay on grower with oyster shells in a side dish. I have boys and don’t want to give layer feed to them
So far cross my fingers and knock on wood never had any leg issues or niacin issues doing it this way
But I did have one get angel wing when I kept the starter feed not switching at 3 weeks my vet told me it was the feed and they need ti be switched by 3 weeks
Not had it happen since and he has fathered over 50 babies and none have got it so not in the genes