My club has 22 trough feeders out. We fill them during the spring and all summer long up til Oct. We have them sitting on the edge of green fields. This keeps the deer coming to the same location all year long. Feeders in spring and summer, green fields in winter. We use 20% protien feed. The brand is Sportsman Choice. We keep a record of all deer killed which includes weight. After the first full year of using this feed we compared average weight of harvested deer to weight the year before and average weight per deer went up 20 lbs in one year. The second and third year we really begin to see the survival rate of fawns increase. Protein not only helps weight of deer and racks on bucks, it also really helps with milk from does. It is expense, but after eight years we know it is worth it.