Yes you can put grass clippings in your run, but don't put too much as grass clippings start molding if in a pile and you don't want to put too much at a time as the hens need to eat their layer feed so they get enough nutrients to lay eggs, or they may not lay good.
I have a neighbor that brings his grass clippings for my chooks they just love it as i do not have enough grass to keep up with the amount they eat they are like cows always grazing.I have kept chooks for over 50 years and my parents for 60 years never having any problem with grass clippings the thing to watch is straw if jou use it as long strands of it will impact the crop....
Grass clippings are great fun for my 5 girls. One concern I have with mine though is that my dogs poop in the area I mow. They are on heartworm and flea med so worms shouldnt be a problem but I started worrying about that being a risk. I pickup before I mow. But some debris is going to be present
A tiny remnant of poop would not bother a chicken as much as it bothers us!
