I raised rabbits for a few years, and managed to get them totally off the pelleted feed. I gave them hay free choice, a mix of grass, lespedeza, clover and sometimes a bit of alfalfa. They got fresh greens, such as
apple tree prunings, mulberry or maple leaves, dandelion leaves, pigweed,
fresh clover, carrots, Jerusalem artichokes (well washed
roots), and their leaves, and various grasses, including corn leaves and sunflowers,(whole plant except
root). Also gave them bean or
pea vines, small quantities and dried these for hay for them. They got some sunflower seed daily. I even dried kudzu leaves for hay and they relished that. Jerusalem Artichoke or sunflower leaves are easy to dry for hay, also vetch, maple leaves or mulberry.
I never left fresh greens in the cage long enough to mold. If they didn't clean them up in a few hours, they were tossed onto the
compost pile. I fed them fresh greens a couple of times a day. They were actually much healthier on this diet, probably due to the high oil content in the sunflower and the fresh greens. They became much friskier and their eyes and coat shined. They conceived at every breeding.
To get the big litters and plenty of
milk to make them grow fast, they need good quality protein and lots of it, so emphasis is on the legumes and the oil sunflower seeds or another source of oil in the diet. A varied diet they can choose from will balance them out very nicely nutrition wise.
I watched the wild rabbits to see what they particularly loved and fed these things to my domestic rabbits. Of course, I culled out the ones who did not gain well on this diet and kept the best producers and after a few generations, they were really doing well, producing big litters. They always had a mineral salt block to lick and fresh water. They were in
wood and wire cages with hay on the floor over the wire and had more room than most domestic rabbits are in. The pregnant does had a 4 x 6 or 8 foot cage.
The downside of growing and gathering all this feed for them is the investment in labor. If you have the time it is well worth it.