I would like to make a technical point. Increasingly, people are quoting the quasi-statistic that "anywhere one has to talk acres per cow, rather than cows per acre, is no place to be grazing livestock."
Even the world's most intensively managed irrigated pastures do not often support a stocking rate in excess of one cow per acre. That means stocking rates on the vast majority of the world's grazing lands are correctly measured in acres per cow.
Deming, New Mexico