I echo what mrbb said. The reality is the only one benefiting from winter supplemental feeding is the person doing the feeding. Seeing more deer and thinking you are doing something good is the only benefit. Deer naturally change metabolism and diet requirements in winter. Here in Vermont about the only help some give is cut a few cedar bows down but it doesn't have much nutrition and is easy and natural for them to digest. Feeding deer anytime of the year is illegal here due to the states position that doing so promotes the spread of cwd and other respiratory illnesses. My advice don't do it. Nothing to really gain. If you want to attract deer to your property plant some natural crops and a few apple trees.