Any forage that is cut and dried and kept for feeding later is hay. Deer don't eat hay. When a plant is mature enough for hay, the fiber content is too high for deer to utilize it. Deer need high protien not high fiber. All plants convert to higher fiber content as they mature. Some of the commercial deer seed companies have products that will grow in winter, even under snow covered fields, just be sure to use seed developed for deer, not livestock. Plant and storecorn, oats &wheat for sillage, construct several feeding stations away from stand sites and pour the feed to them, you should increase the population on your property. If you can afford it, there are many companies that make deer chow, comes in a bag like dog food, that is formulated especially for whitetails. Plant corn, soybeans, wheat and oats and let these fields stand in winter, do not harvest, deer will use these fields after the clover is gone.