I'm new to ducks. I've read that Niacin is important for their leg development. The feed that we got for them is DuMOR Chick Starter/Grower 20%. One of the reviews said it wasn't good for ducks b/c it didn't have enough Niacin so their ducks were having problems with their legs. How would I go about making sure that they get enough Niacin? What foods can I give them to ensure this? The person in the review mentioned giving them brewers yeast. Does that work? How much would I give them? Can you give them just any yeast? I have some yeast for my bread machine, can I give them that? Also...what kind of treats can I give my ducks? They are living in an xl dog crate in our house for the time being. I will be putting them in a chicken tractor on nice days as much as possible, but I need to wait until they are big enough to let them out to free range with my chickens. I want to make sure they are getting enough greens and such, but I'm not sure if there are any foods that I shouldn't be giving them. KWIM?