I have citrus trees, but I used to raise exotics and citrus was always something you weren't supposed to feed them. If fruit drops from my trees the birds don't touch them.I make enzyme cleaner from my citrus and pineapple scrapes, can I use my "cleaner" to put in their water? It's just peels, sugar and water...
Here's a treat list to help
https://www.backyardchickens.com/a/chicken-treat-chart-the-best-treats-for-backyard-chickens