Giving a little extra feed right at dusk can certainly help. Getting extra calories in right before bed triggers the metabolism in a way that will help heat the body. This is a proven theory and used by people camping in the wilderness as well. Whether cracked corn is any better than their regular feed is debatable. Carbs provide quick energy but that also means you burn them off quickly, proteins are longer slower burning and may last longer into the night.
Amount of birds relative to coop size is not important. Birds fluff up their feathers to trap and warm a layer of air close to their bodies, the same way your puffy winter jacket works. Their body heat quickly heats this air and their feathers trap it in place so they are each in their own warm little bubble. If you provide them with a draft free shelter, they should be just fine.
Amount of birds relative to coop size is not important. Birds fluff up their feathers to trap and warm a layer of air close to their bodies, the same way your puffy winter jacket works. Their body heat quickly heats this air and their feathers trap it in place so they are each in their own warm little bubble. If you provide them with a draft free shelter, they should be just fine.