So, taking it that you said you live in Arizona and "your family has a farm in Chihuahua," a quick congratulations are in order. You're an absentee landowner! You're right at the peak of farming's social pyramid. Living the dream.
From that distance, it's understandable that you have a poor grasp on water, land, & how they play out in various types of agriculture.
Lots of cultures have used low- or no-meat diets. The Ganges valley, ancient Egypt, China, much of early Europe, etc.
Notice anything in common there?
They're all very, very wet. Plants that are edible for humans grow readily.
E.g. the Bedouin, Mongols, Maasai, Inuit, etc.
What do these have in common? They're in places that are either very dry or very cold. Either the plants that grow are very sparse & tough, or none at all.
The entire rest of the plant is inedible for us. Stalk, branch, dry leaves, etc.
But... cows, sheep, goats, horses, bison, deer, camels, & other ruminants can digest all of it.
We can't do that. We eat straw, we just poop out straw.
(the oceanic food chain that Inuit & other maritime peoples are looped into is a whole 'nother discussion.)
We can also fall short by failing to recognize that for dry regions, the bottleneck in productivity isn't land. It's water.
How much? A cow needs about 18.5 gal/day, so 10 of them for a year need about 67,000 gallons.
Now let's look at how much it takes to grow vegetables on that same land.
For the non-farmers and absentee landlords following along, an acre-inch is just how much water it takes to cover an acre of land 1" deep.
It's about 27,000 gallons.
An acre of crops needs that every single week.
73 acres x 40 weeks x 27,000 gallons/week = 79 MILLION gallons of water.
It takes a thousand times more water to grow an acre of crops for human consumption, than it takes to grow an acre of cow on wild range.
This river's drying up so hard that it's the subject of a dedicated WWF preservation project.
Exactly. A crop-only diet can feed 10x as many people. But it takes 1000x as much water.
And in places where there's a lot of land and limited water, it makes sense to optimize for water. So there, grow & eat ruminants.
You know what region that describes really well? Northwestern Europe.