The deer I am referring to are in a farming country with all the clover corn soybeans they can ingest available for most of the year, that being said we can tell a huge difference in antler growth in a bountiful wet yr versus a dry one, two yrs ago was a wet yr and there were tons of amazing size deer racks harvested versus 2018 was extremely dry, nice deer with giant racks were a lot more scarce.
I do believe genetics play a pretty significant roll in the outcome, not unlike all domestic animals are bred for the characteristics that one is looking for.
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All the really good ideas I've ever had came to me while I was milking a cow.