Antler Attakk Deer Supplement is designed for year around use in any climate. It has chelated minerals that makes it easier for the animals to digest and also makes it easier on their digestive tract. Antler Attakk has milk calcium included which increases blood flow to the antlers to stimulate faster growth for those big bucks. It has one of the highest contents of calcium and phosphorus on the market along with the addition of several different vitamins and attractants. 10 lb bag.