how much protien should be in the feed for both ducklings and for adults? i really need to know b/c i have 2 new day old ducklings and 4 older ducklings (a little over 2 months old) and one of my older ducklings has started to get angel wing and i know that can be from too much protien. so i want to be able to fix the problem so my others don't get it aswell.