I recently watched an hour long video presentation on rehabilitating a place in southwest New Mexico called "Whirlwind" using Keyline plowing. The presenter said that the land in that area thousands of years ago used to be grassland savanna. The types of grasses present during that time had evolved in conjunction with herds of grazing herbivores. I got the idea it was a symbiotic relationship between the grasses and the herbivores, each depending on the other for existence.
On our farm, the pastures consist of native grasses such as blue grama, buffalo grass, Western wheatgrass and bluestem. These are all grasses that evolved because of the low rainfall and herds of grazing herbivores. Here is my question. Pigs are not herbivores. Will the pigs eventually destroy the native grasses in my pastures since they will be exerting a different kind of pressure on them i.e. rooting behavior?
Hogs are grazers, but they are also omnivores, they will eat what they can find to eat.
If you keep them moving from paddock to paddock, they will graze and not destroy the pasture.
If you leave them in one place for more than a day or two, they will begin to root.
I have three AGH and when I am putting them on pasture that I want to keep I move them every 2 days, their paddock size is 1/4 acre square when I am moving them for grazing.
Now one thing you have to keep in mind is that most times you hear about the animal/ grass land relationship, it is large animals being referred to, Bison and other bovines, Deer and Elk are the usual animal references.
These animals are large enough to trample, manure and move on, they will also browse on tender tree growth.
There is a lot to know when you want to get into using animals the way nature uses animals.
Hogs are usually moved into an overgrown area to "mess things up" so the land can be repurposed quickly.