Steena; Fermenting feed is easy. Most people suggest a "two bucket" system. One bucket with a bunch of holes drilled in it sitting in a second bucket. (I suggest getting food grade buckets but I just use two clear plastic rubbermaids.) Then you pour a bunch of water in it, and some feed and let it sit. You can add some unpasteurized Apple Cider Vinegar with the mother in tact to help it ferment faster. Mix it once or twice a day. The colder it is out the slower the ferment. It can take a week or two to get it started but once it's going it doesn't stop unless it freezes or boils or dries out, it just slows way down in the cold.
Missa; Since I give fermented feed, I add all sorts of things to it. I add cubed alfalfa for horses to it since it's about %16 protein and high in calcium... It's a really good chicken feed. Since it gets mixed into a pastey mush with the feed and the grains they eat it right along side the rest.
I find that in general my chickens don't like eating hard things. Which is why they dislike fresh squash, and carrots, hay and their favorite seeds are either cracked or softer... But if I let them have squash guts, old mushy carrots, anything soft and older they go crazy! I put out 4-5 carrots from the bottom of the bags out for my birds once and they weren't touched for a week. Then one day they were all very pock marked and were half-eaten clearly by chickens because they'd softened up. They were gone completely within a few days. They also like the fermented feed mash WAY more than they like regular layer pellets.
Mine consume hard items readily, sometimes even intact acorns that are obviously hard to swallow. We are starting to go overboard with the reprocessed (fermented) feeds. Some tough to digest items, yes, fermenting may enhance availability or even generate some nutrients, especially vitamins. In other instances the fermentation process may destroy some nutrients, especially vitamins. I would effort to supply a mixture of fermented and not to reduce odds of imbalanced diet.