Sergio Rivero (2009) and many others actually, each cow has an average area of 1 hectare or 10 thousand square meters or 2.47 acres! Yes, each cow.
Food is the (R)evolution. There is no other.

If it is natural grasslands that receive limited rainfall this number is about right. Well managed grazing will do wonders for the ecosystem. For hundreds of years the Argentinian Pampa was a prime example. With a 8–10 year cycle of grazing followed by 2–3 years of cropping. Best meats and grains ever. Now sadly wall to wall cash cropping year after year to feed European pigs and chickens while all or most local cattle are confined as well in industrial pens.