I started doing soaked feed a couple weeks ago - the benefits seem worth it. The ducks loved it from the get go but the chickens weren't too sure about it. Now that they are used to it, it's a knock down drag out when I take the food out!!! They don't usually squabble over food but they love this stuff. I've moved on to fermenting about a few days or so ago and they love that just as much. I do notice that they seem to fill up faster and stay full longer.
I also add ACV and garlic to their food mix and sometimes to their water. The fermented feed smells like a good sourdough bread to me - I don't know if that means it's yeasty or if it's 'right'. I've never had lacto-fermented sauerkraut (that I know of) so I'm not sure what that smells like. I'm feeding anyone over 2 months old this mixture (the hens and ducks get layer mash, duck pellets, and scratch grain mixed and soaked/fermented, the younger batch gets grower mash and scratch grains mixed and soaked/fermented). Prior to that the younger flock was on non-medicated starter feed.They get lots of other treats, too, daily. Fresh fruits and veggies (apples and grapes are a favorite, as are peas). The older flock and the ducks all free range, the younger flock is in a chicken tractor well away from the older flock. Unless it's found to be harmful or of absolutely no nutritional benefit over going back to dry feed, I will continue this way. I'm curious as to how they will do on it during the winter . . . I will probably offer both types of feed just to make sure nobody goes hungry once there is little or no grazing left. I am letting large areas of grass and clover go to seed in the yard and am going to grow a late garden, possibly even use a cold-frame in or around the coop for them to still have some fresh greens without draining my wallet, lol. Combined with fresh mealworms, they should get through winter quite well this year. They did fine last year on dry mash and store-bought fruits and veggies, though, too . . . I will have to look into the EM mentioned in the posts above. It sounds interesting.