I've been supplementing my ducklings feed with niacin (in the form of brewer's yeast) as suggested on here. I noticed this morning that I opened the last container I had, and was wondering how much longer they will need it? (as in should I buy more or just use up what I have and call it good.) They are just about 5 weeks old. I thought I saw somewhere on here they need it until they are 6 weeks old...but I couldn't find it again, so I thought I'd ask to be sure.
