Here is my 2 cents. I add organic plain yogurt to the bowl and put the feed on top of the feed once a week. I put organic apple cider vinager in the water once a week. I offer oregano oil once a week on a seperate day in the water feeder to assist as a natural antibiotic. I let them range as much as possible and offer treats once a week, like a huge zuccini or a box of fruit that is too ripe... nothing with oils however, so no cooked stuff. The once a week rule has kept my birds very happy and healthy. I have 23 chickens so I can offer larger amounts. For a few hens it should be sparingly or they may get sick from overly rich foods. Like giving children too much candy. Ducks should NEVER be fed bread only seeds and grasses. I also save the egg shells and wash them, dry them and crush them and put them in the feeder to help with calcium they need for healthy egg laying and healthy chickens/ducks. Karen