Look at the states who have bigger deer on average how do they differ from NY, MI, and southern states?
Oh I don't know......Soil nutrient content?
We have friends in Iowa. The she of that couple loves flowers. She can go out in their yard and dig a hole....plant the flower....and fill it back up with the dirt she removed. If my wife did that.....all we've done is bought a 1 week decoration. Without filling the hole, here, with rich topsoil.....that plant won't not only thrive.....it won't survive.
2 Deer.....both eating corn and soy beans.......one eating them in NC.....one eating them in Iowa. Which one gets bigger? Now compound that through years and years of genetics....and it doesn't take a biologist to figure out why the deer are bigger in some areas of the country.
They eat healthier. They produce healthier offspring because of that fact. And so on....and so on....and so on......