Although genetics does play a role in antler development,other factors are involved.The 1st couple of years of a deers life are devoted towards body development and growth.After his body and skeletal system has developed properly,the nutrients he takes in are geared to rack development.So with a good diet and a chance to see 5 1/2 years of age,a spike can(and probably will)develop a nice set of antlers.I read a few studies on this subject-really good reading.