Some useful info I found.
Deer Antler growth usually begins during the month of March or April, by August or early September, antlers are fully-grown. In most cases the typical deer antlers begins growth out of the head in a backward motion, then quickly changes direction and sweeps forward.
Deer antlers are among the fastest growing tissues known to man.
Growing as much as a Ĺ inch per day during peak development. The development process can vary greatly depending upon the genes and nutrition of each deer. Growing antlers are covered with a living tissue called velvet. During development, the deerís antlers are very delicate and extremely sensitive to the touch. This is also the time when most antler damage or breakage occurs.
Velvet is shed or rubbed off by the buck as he rubs saplings with his antlers. Older bucks will shed their velvet before younger bucks. A buckís first set of antlers begins to grow when itís about 10 months old. Spikes are more common in yearling deer than older ones because antler growth starts at a time when the young buckís body is still growing rapidly. Antler development is tied in closely with the animalís nutritional status. Older bucks might also carry spikes if they come from an area with poor food conditions.
Good nutrition is required for button-buck fawns to grow large pedicels. Often, the larger the pedicel, the larger the antlers will be at a later age. Like I said earlier, antlers can grow at the rate of a Ĺ inch per day, but body growth takes precedence over antler growth. Any deficiency in dietary energy, protein, calcium, phosphorus or certain vitamins during spring and summer can have strong negative effects.