I add alfalfa hay, which is the stuff I clean up around the hay stack and wouldn't feed to the horses. They eat the leaves and the coarses stuff gets. Ground up as bedding. This makes the best compost for the garden, since alfalfa is really good for both the chickens and the garden.I throw it into the coop once a week as my bedding, two or three big feed sacks full.
I also plant mustard greens, kale and will be adding chard and collards soon. I give them armloads of "salad" everyday. In addition, I cut fresh grass, Bermuda in the summer, rye in the winter and throw it in their run. In the summer, I add amaranth they eat the greens and seeds), sesame and buckwheat. I'll also plant bitter melon, squash, some extra cherry tomatoes and maybe a climbing type Asian green or sweet potato vine on the outside of their run. Things that grow well with minimal care and make good use of wasted space, plus attract pollinators, predatory bugs, hummingbirds and butterflies to my garden.
Finally, I keep a large container, about four quart size, next to the sink. It takes one day to get full and it's just hubby and I. Eggshells, melon guts/shells, squash guts/shells, ends of tomatoes, carrot peels, funky leftovers, scrapings off the plates. Those go to the chickens daily. Even meat, the fatty trimmings from a roast, the meat left a little too long in the fridge, etc is all fair game. They probably get a full container once a day, plus I clean the fridge weekly and take out a huge commercial sized stainless steel bowl full of everything that's starting to look yucky. That little bit of soup, little bit of cooked broccoli. I don't add salt, we eat no processed foods so everything is really healthy. No sugar, either.
I've been getting 11-12 eggs from 15 hens of breeds not known to be great layers, mostly known for seasonal laying. I'm also feeding a bunch of production red packing peanut Roos, 12 Cornish x that are overdue to process and 6 red broilers.
when it rains, I throw down mustard seed in an area of ground that. Can't seem to get anything else to grow on. I need to get some mangel beet seed and daikon radish seeds to add to that mixture as a cover crop. Next summer, that area will be sweet potato vines, which the chickens can't get enough of and are very pretty.