I did this all the time and not only were there no issues but they loved it. I would cut the grass just to dump all the clippings in their run and coop. My lawn was the best kept law in the city.I have a covered chicken run that's got a floor of woodchips over dirt. Now that it's springwe just mowed our front lawn. The girls don't have access to grass in our suburban backyard they free-range in. I was going to put a bucket of grass clippings in their run for them to scratch around and eat or whatever they want! But I'm reading posts and getting mixed messages about if it's a Do or Don't. The grass clippings seem to all be under 2". See pic.
And if it is acceptable, should I just dump all the grass clippings in there or limit how much I put in there? Wondering if it's a good ground layer for the run itself?