I found out recently that Oyster Shell is good for feeding to chickens. We have a livestock grade and a garden grade. It provides calcium to the hens which in turn makes for stronger shells on the eggs. So if you get flaky eggshells (like I do) from your hens, put some oyster shell in there… or just let your hens loose on your bocce ball court.
Note: playing bocce ball while hens or eggs are on the court is not recommended!
Also in stock for your hens… Diatomaceous Earth. This material is a great natural insect repellent that is safe for pets and people but keeps insects away. Use it in roosts and nesting or laying boxes to keep the pests away from your hens and chicks.