My ducks eat a lot! I have 43. I tried using those large metal feeders but I found that the feed wasn’t coming down...no mater what level I put the metal hinges at. So, then, I’d come out to starving ducks and half full feeders. So now I feed them twice a day with snacks...not over 10%, and most of what I give involves veggies. We made them feeders built into the wall of the barn, and then I use two pans on the floor for the smaller ones. They get 18% protein. What I’m doing right now is I have crumbles in one bin and layers mixed with a small amount of cracked corn in another. I’ll do one scoop of each Into my bucket. I give them two 5 gallon buckets a day...give or take. But, they are still hungry. Is this not enough? I have 19 chickens who have a big plastic feeder and a small feeder and I only fill that like ever three days. Same food. I’m getting off the layer now due to winter but I buy my feed like ten 50 lb bags at time of each, so, I’m using this up. I will still stick to the crumbles at 19% protein. The feed is very similar to the ingredients of the Purina brands, just made locally.