The photo gallery above showcases the antler growth on a captive 5-year-old whitetail buck; the 1-minute YouTube video below takes you through the entire antler growing season for the impressive animal. 

Jake Hofer, who posted the interesting video, wrote the following to describe it:

“Velvet is considered to be one of the fastest growing mammal tissues on earth. The cartilaginous antler is a pre-calcified stage of growth. Once testosterone increases in the bucks, they will shed their velvet at the end of summer.  It's said deer antlers can grow at a rate of 1/4 inch per day.”

Of course, bucks will live with hard antlers throughout the fall and into winter, then shed them well before spring, when the entire process begins anew.