Antlers help to dissipate body heat, like a radiator. When the temps drop like they are now they will shed to keep body heat. Back in the day when late buck opened thanksgiving day a buddy shot a nice buck and when he grabbed his antlers to drag it they came off in his hands. It was -20 out that year, I shot a nice buck the same day that year -22 that day where I was and his antlers were hard as a rock and he was rutting hard.