Are you sure it is a mineral deficiency and not rut sparring or brush beating breaking the antlers? I saw what looked like a huge 7x7 bull in New Mexico after the rut, and then I got closer and saw that he was a 3x7, having points broken off all along one one side. He was still play sparring with a 5x5 that was hanging with him, and this was in November. The 6x6 bull I took in the same general area had the tips broken off half the points on his left side.