I have a flock of eight but I keep their food out 24/7. How much did you mix in?Yes I have.
I didn't experiment and I found that it did not boost egg production but it did make the yolks of my eggs more orangey.
At the time I was fermenting feed so I put enough cayenne pepper in the food to make it an orange color.
That was about a couple of tablespoons worth of cayenne pepper per day for my flock of eight.