I hatched out some SQ Cayuga ducklings a couple weeks ago. I just noticed tonight that they are getting white blotches on their bills. It does not appear to be an infection or anything, just a color change. Here are some images. Is this normal for this type of duck? They have been getting fed high protein gamebird starter supplemented with brewers yeast for Niacin. They are otherwise happy and lively (little biters), being raised with Guinea Keets and Chicks.