Is it like an all flock? where it's for all stages of life. That is what I have always used but mine are usually with their mama so their diet is varied from the start. Anything you buy though be careful it is for planting because it's been treated with chemicals or pesticides. Purina Flock Raiser has I believe 20% protein and I cut it by adding whole oats like reg oatmeal not instant, and wheat. I buy my wheat at the grocery store in the bulk bins a co op would probably be cheaper if you have one. Some ducklings just seem to be prone to it but if caught in time is an easy fix. Just a sprinkle of oats and or wheat over his feed will probably be enough.
Plan B
panty hose. lol
