Mallard and Rouen - 3 weeks 2x Mallards - 2 weeks All have been on Flock raiser 20%. Storey's said they should be brought down to 18% protein after 2 weeks. Only thing I can find is Start and Grow at 18%. It's non-medicated. Is this OK for the ducklings? Should I gradually change them over? Do I need to keep up with the Niacin and Vitamins/Electrolytes Plus and ACV? Should I add it gradually into their feed or switch them over once all the Flock Raiser is finished? Any help would be great. Tried researching and getting a mixed bag of info.