That sounds like something from one of my nightmares. I am terribly waspaphobic, though I can handle a singular honey bee or bumble bee buzzing around as long as they are totally engrossed in a flower. To have a group of bees in my chicken feed? I hope they aren't the killer bees (seeing as you're in Arizona). I specifically don't have a wooden coop (I have the plastic Eglu) because I know wasps would be more likely to build a nest on it, or hang out all over it to harvest the wood for their nests.
I was so hoping that the chickens would eat wasps, but I knocked down a nest the other day (it was only about 43 degrees out) that had a few groggy wasps in it, and my chickens would have nothing of them though they'll eat any other bug/insect in a heart beat. Darn stinging insects! If it wasn't for their effective pollination, I'd love to see bees and wasps wiped off the earth! I don't care much for honey.