From The Cow Docs:
"We Grow Beef Because We Can't Grow Vegetables Here"For more explanation of cattle on grasslands, read the rest here.
...Our climate dictates that only certain thing[s] do well here. For example, vegetables are a poor crop choice for most of the state. Yes, my wife’s garden looks phenomenal, but only because she uses a few thousand gallons of water on it each year. If we tried to raise water-intensive crops out here like that on a statewide scale, we’d make California look damp in no time.
...By putting cattle on land that is unsuitable for crops, we can use it to make a nutrient-dense food source. And, if we want the best of both worlds (which we always do in agriculture), we can graze cattle for most of their lives and feed them corn for the last few months so they reach slaughter size more efficiently (meaning, same size but using fewer resources).