I'm learning on the fly here... Soon we'll be starting to mow our lawn/pasture. Our hens are free-range. Will it be OK for them to roam around on the freshly mowed surface? I've read a few posts about lawn-mower clippings causing impacted crops. I don't want to kill my whole flock, but then, I don't want to have to put up 300 ft of fencing either.