We have a 13-14 weeks old muscovy duck (approximated) and he (we think its a "he" LOL) has been eating for the last 6 weeks Purina Flock Raiser Crumbles (protein 20%) as that's the only brand we found at the feed store and they suggested it would be good for him. Soon we will have to buy a new bag of food so we want to make sure if we need to change the food or keep feeding him with the same one. We keep the same protein % or we reduce it by getting a different option?Any advice please??? Also, Should we give him other kind of supplementary food? We tried to give him corn and green peas but at first he freaked out and made a noise like a barking but he started to eating it a little when I put the food in my hand. He seems spoiled maybe. Somebody suggested me in the past to get Purina Duck Chow (grower) but we could not find that one and they dont know it by that name at the feed store. Anybody use it? Looking forward to the responses. Thanks a lot! Rusty and Ducky Lucas.