Every bottle of grave digger doe estrous contains soil impregnated with CODE BLUE's unique From One Deer to One Bottle doe estrous formula. Shake it onto scrapes or mock scrapes. Lasts up to 30 days. Doe estrous fuels deer season. It's the reason for the rut. Use it to your advantage, shake grave digger doe estrous onto scrapes for a powerful message bucks can't miss. Every bottle of grave digger doe estrous contains soil impregnated with CODE BLUE's unique From One Deer to One Bottle doe estrous formula. Treat a scrape or mock scrape for up to 30 days of time-release buck enticement. Grave digger doe estrous stays effective in freezing temps.