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Our feed supplier recommends no more than 5% of the hens' ration per day, to keep from diluting the hens' ration too much. So, for 18 hens that would be around a quarter pound per day, less than a cups worth. A little more in winter, as they tend to eat more in cold weather, but don't necessarily need the extra protein and minerals that comes with the extra consumption.
Winter feeding of corn doesn't necessarily make them warmer, as they will eat what they need of their layer ration to keep warm, but as I said, they don't need the extra protein and minerals, so the corn can help by diluting the ration in cold weather.
Feeding corn at bedtime to keep them warm, as some will suggest, isn't the the best thing to do. They do most of their shell production at night, through the next morning until they lay, and they need a crop full of layer feed (with its calcium) to get them through the night until they can get up in the morning, get more layer feed, and finish producing that egg. In the absence of calcium in the crop/gizzard, they draw on their own calcium reserves, still produce that egg, and then stock up on calcium later, but it can possibly lead to poorer quality shells, especially in older hens.