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I'll try to be somewhat nice. No promises though.
Scratch is grains, usually heavy in corn, used to feed chickens. I personally do not feed it. They get plenty of other treats from my garden and kitchen.
Scratch is heavy on energy and fairly light on real nutrients. If you are keeping track of your chickens' diet and want to make them the most efficient at either laying or putting on weight, scratch can mess that balance up with them eating too much scratch and not enough of their feed which is formulated to provide everything they need. You can mess up that balance by feeding too much other treats too, like pumpkin or cabbage. If you let your chickens out where they can eat greens, creepy-crawlies, seeds, and anything else they can find or catch, you've lost control over that balance too, but odds are they will manage a relatively healthy diet anyway. It just won't be scientifically formulated. When I grew up, our chickens experienced the "no fences" definition of free range all seasons. In the winter we would throw them some shelled corn to supplement their diet when there was snow on the ground and they did get the pickings of the seeds from the hay we fed the cows. All this is considered scratch. Most of their diet was seeds and other things they found. I'm sure they were not at peak efficiency in the winter, but they were not laying that much anyway. Some, but not that much. The point of this is for you to consider how important it is to you that they have a scientifically formulated balanced diet and be guided from there. Contrary to what you may get out of this, I keep mine locked in the coop and run where they cannot forage for themselves and I do concern myself with a balanced diet.
Some people feed scratch to help keep them warm in the cold weather. Since it is high in calories, it provides extra energy which can be used to keep them warm. Or maybe, if you feed it just before they go to bed, it helps keep extra blood near the body core while they are digesting it, which is what you want to keep them warm. Blood near the body surface radiates more heat that blood in the body core where it is better insulated. I personally think this concern is a bit over the top for many of us, depending on your climate and conditions of course, since I see mine out dust bathing and hanging around in the run in temperatures in the teens Fahrenheit (say -10 C) as long as they are out of the wind. I think their down coat does a good job keeping them warm.
I butcher my own chickens. I have noticed that many have a lot of fat inside, especially around the vent and wrapped around their gizzard and other internal organs. I don't see how that much fat can be healthy, although they do not appear to be fat just looking at them and they are active and they lay well. I mostly feed mine a 16% layer feed and greens from my garden, not a high fat high energy diet. I just don't see that they need any more high energy food.
Hopefully I was nice enough and I explained why I do not feed scratch.