Spring through September the antler-growing cycle for whitetails is approximately 170 days. This gives a buck many opportunities to catch a velvet antler on a fence, smash it against a tree as he flees danger, etc.
Antlers grow fast—up to an inch per day in the summer! They have a complex system of blood vessels that carry nutrients through the velvet and down into the core.
When a growing antler is broken, it bleeds profusely, and blood can pool and fill the inside of the velvet. When the hardening of the bone process occurs in September the pooled blood can create a heavy, swollen, club-like antler.
If the injury is to the pedicle (the base of an antler) then the deformity could persist for several sets of antlers or even for the rest of the buck’s life, making him a permanent non-typical. Interesting!