Bull moose shed their antlers every year. And every year they grow a new set. The reason is that antlers are not like ruminant horns. Antlers are made of true bone, without a central core and a horny sheath, and so antlers frequently break. Except for the musk deer of central Asia, and the Chinese water deer, the males of all living deer have antlers.
Reindeer are unique in that both males and females have antlers.
It is known as an elk in Europe. Laws now protect it in both North America and Europe, and hunting is much more tightly controlled. Well, the antlers are used largely in displays and as weapons when the males fight for females, and breakages are common during the rut. Suddenly, a moose protecting her young charged at him. A few seconds later the stunned moose stumbled to its feet and slowly staggered away.