One other thing, it is a big misconception that a high fence is to keep deer in. In the Texas Hill country where over population is such a huge problem, the fences are to keep deer out. To grow big deer, you need a maximum of one deer for every 10 acers, preferably 1 to 15 or 20. Out side the high fence, 1 deer to 2 1/2 acers is common. The deer on the outside will literally be trying to get in, because the food on the inside is so much better.
Once a place is high fenced, and you kill deer back to at least 1 deer per 10 acres, you will see the body weights increase about 50% just because they have more food. With more food and age, the horns get huge.
The other problem with a low fence is that most of the places are small, and you can pass on big young deer trying to let them get bigger, and as soon as the rut gets here and that buck jumps over the fence after a doe, he gets hammered by some jackass who sees horns and blasts him. Although that deer spends 99% of it's time on your place.