The state culls the deer population every few years, here, also. In the state parks, they over-breed and end up starving or causing a traffic hazard from eating along the roads.
The state uses a lottery system, closes the parks to visitors, and lottery winners can "hunt" the deer for a short time. It's a bullshit hunt, though, because I have literally fed the deer at the parks out of my hands.
The whole thing sucks, but I suppose it is necessary on some level.