I feed it as a treat. It's simply something to break up the monotony of living in an enclosed pen, and it's something they very much look forward to every day. As far as empty calories with no nutritional value, I'd have to somewhat disagree. While it comes nowhere close to fulfilling a chicken's nutritional requirements, keep in mind that many species of birds depend solely on seeds and grains for their survival. Could my birds survive without it? Definitely. Would they be healthier without it? Possibly. Would they be as happy to see me walking towards their pen? Since I don't have vegetable matter to give them every day, not likely.Is there any reason in particular you feed scratch grains? I don't, I think scratch grains are empty calories with no nutritional value whatsoever. They don't really have any benefit for me or my birds. What they do is just encourage natural pecking behavior, supposedly. My girls do that anyway, without scratch grains.
I never feed enough scratch grains for them to get filled up. It's more of an appetizer because, normally, once they've finished scratching and pecking they'll hit the feeder... voraciously.