I give my hens kale almost every day. I get a big bag of it from the Grocery Outlet. They get grass clippings on the weekend but I will not be mowing as much soonPumpkin seeds have good protein content, kale, cottage cheese, tofu and canned catfood is fine for chickens. If you are concerned about mercury stay away from tuna types. I give mine any meat scraps after supper too, cut small.