Um... I have no idea why someone would choose to remove the grass, which they would have enjoyed eating. Perhaps it's b/c their paradigm is to see a soil compacted poopy run instead of one that is lush and green??? The general rule of thumb for a back yard flock is a minimum of 4 s.f. in the...
Exactly how big is their run? You can do a lot by converting their run to a deep litter, or composting run. Put compostable materials in there: leaves, grass clippings, hay, kitchen and garden debris, coop litter, wood chips. The goal would be to get the litter at least 6" deep. This will...