At best there are maybe 20 thousand left of the ranges. A wild mare gives birth every second year or so to only one foal. Twins are very rare and usually don't survive. So how do you come up with a doubling every 5 years? That makes no sense. I know, the slaughter industry must have paid you well to write such nonsense. How come they put cattle out within the same hour on the same ranges that they removed the horses from, often violently,that supposedly could not sustain the horses? Ask yourself that. Horses prevent wildfires by eating brush and non native grasses that the cows don't touch. Horses have evolved here. They belong on this land. The cattle and sheep don't. The cattle ranchers and mining industry wants the horses gone and other protected species so they can use the land for their purposes so they invent numbers to justify the removal and killing. The contractors get rich doing the removing and get paid up to 500 dollar per horse or burro, dead or alive so they don't care...