None of your fall annuals are really going to help with antler growth--by the time the bucks need them the next spring they are either in their last stages or not too palatable. If you are really concerned about antler growth you need to concentrate on warm season high protein plants. Annuals would include your beans and peas (soybeans/cowpeas)---these are super palatable and will really add the protein needed for antler growth. As far as perennials you can't go wrong with clovers, alfalfa, trefoil, and chicory--all provide lots of protein during the antler growing and fawning season.
Turnips and other brassicas are more of a late season food and do provide both good carbs and protein but by the time antler season arrives they are usually flowering out and not too palatable.