Thanks for the reply. That feed is not suitable for quail or any gamebird, regardless of what the manufacturer 'claims'.
Try finding a complete and balanced feed of at least 24% protien. There are many manufacturers and distributors of a quality feed for gamebirds.
When feeding that much 'seed'...
Can you post a pic of the ingredients tag on the feed bag? It might help determine if it's the feed causing the issue. Also, do you use a 'municipal' water source or 'well' water?