I also routinely start young goslings (1+ week old) on finely-chopped, chemical-free grass clippings with chick grit as a supplement to their formulated feed and have not experienced any adverse effects from doing so. As they get older, they have access to pasture.
They're in a very fast growth period, so I would be cautious about restricting their supplemental feed at this stage, when they're putting so many resources into feathering, etc.
As @Jenbirdee mentioned, angel wing is very distinctive, with a marked twist outward. I also don't see anything in...
Congratulations!
What kind of predators do you have where you live? Free ranging will expose both your adult ducks and ducklings to risk of predation, and the ducklings will be easy prey for animals like foxes, hawks, and even domestic cats and dogs. Even snapping turtles can pose a risk to...
While I know it can be disheartening not to see appreciable improvement yet, it can take time, even if the supplements and/or medications are addressing the cause of your gosling's issues.
Have you considered the possibility of neurological involvement related to the crest? This thread...
In my experience, some goslings seem to have difficulty assimilating certain vitamins/nutrients than other goslings do (another possibility is that they may not consume as much, if it's in their food and everyone is eating out of the same feeder, for example), so even among goslings that are all...
I raise Pilgrim geese, and have raised white Chinese in the past. I have not experienced the symptoms you describe with my geese, but would consider vitamin deficiency or exposure to toxins as possible causes, if I saw this in my own geese of this age.
Neurological issues could also be a...
I raise Pilgrims. In the more recent pics of the goslings, they're colored like Pilgrim ganders. Their eyes should also be blue. Does the adult gander have blue eyes?
Sometimes the difference in coloration between males and females at hatch is a matter of degree: the females will be darker in...
I'm with @Goosebaby in suspecting blue-green algae as a possible culprit. Could the goslings have accessed even puddles or standing water that might have toxic algae growth? It can occur even in shallow depressions where water collects and remains for long enough for the cyanobacteria to...
FYI - that's a photo of Chinese goslings. I've raised Chinese and now raise Pilgrims, and Pilgrims - even male goslings - look different from Chinese goslings.
Have you previously had success with this method? I tried it once before and the top just got moldy. :hmm Would definitely like to grow one, though, and have access to tops with some regularity.