I'll have to try the greek.
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I imagine that a lot of commercial yoghurt would be bad as it has a notorious high sugar content. If you can get plain yoghurt that is made the traditional way (like Greek yoghurt for example) I think it would be beneficial as it is full of good bacteria...
I had a similar problem and my chicks were dropping like flies and had to clean crusty butts. Used corid with no luck and couldn't figure out what the issue was