This is debated a lot here in Texas. I would say a combination of genetics and the herd not being overpopulated are a couple of reasons. Another reason is tht there are still a number of large undeveloped tracts of land so the deer can grow up. Of course all that barren looking brush that you see in South Texas is one of the better browse feeds for whitetails that you will find. JMO

Later
Gone_Huntin