I’d have to disagree, but forewarning, doesn’t mean I’m correct.
Minerals come in many forms and purposes. There are, as I’m sure you know, minerals to assist with bone growth / antler development. Your calcium and such. Then there are minerals that are essential for immunity and health, especially for does during pregnancy and lactation, such as phosphorous and trace minerals. Essentially minerals are….essential, and have a huge effect on the atp in the animals systems. Now, if you’re putting them out and not getting much action, there is either enough naturally or placed in a horrible spot.
Deer get a maintenance level of nutrients and minerals from a natural environment. An environment will always or should always, less impacted by humans, to provide for the healthy numbers of deer on it.
Will supplemented feed and minerals create monsters and genetic freaks? No, a deer is only gonna grow to their genetic potential. But…maybe they aren’t reaching genetic potential.
As a human, very physically active, I’ve done tests to myself where I lack some minerals and supplemented, notice a difference too. Huge? Probably not. A diff though, if we spend time on our land helping the wildlife, why stop in the winter at their hardest point after a rut cycle where bucks are vulnerable and during a does pregnancy when she needs the most?
Salt, phosphorous, copper, maganese and zinc are huge overall for heard health, all the time of the year for immunity, health, gestation.