The percentage of crude protein in grass is based on dry matter, so grass clippings have a high moisture content and far lower crude protein percentage than that, as well grass has a high cellulose content that chickens cannot digest.This caught my eye, as I give my four hens huge amounts of grass clippings in the summer - with no drop in egg production, and they don't get any grass when it's dry, and the eggs keeping coming at the same rate. However, it made me wonder about protein content in grass, and from the first search I did just now, it claims that grass has between 16-28% protein, with variables, of course.