I found that fermenting my quail feed meant I could keep them indoors. It massively reduced the smell they produced. Here's a thread all about it (I'll link you to the page with links to scientific research):
https://www.backyardchickens.com/threads/fermented-feeds-anyone-using-them.645057/page-876
And here's an article about how to ferment - its easy:
https://tikktok.wordpress.com/2014/04/13/fermented-feed-faq/
https://www.backyardchickens.com/threads/fermented-feeds-anyone-using-them.645057/page-876
And here's an article about how to ferment - its easy:
https://tikktok.wordpress.com/2014/04/13/fermented-feed-faq/