Studies have shown, aside from obvious genetics, diet, etc. that one of the biggest factors affecting a buck's antlers and growth is epigenetic factors, such as nutrition of the mother while carrying the buck.

Scientist and Author, Fly Fishing for Redeye Bass: An Adventure Across Southern Waters and Alabama's Best Fly Fishing
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"I do not hunt turkeys because I want to, I hunt them because I have to." - Tom Kelly