Looked up imperial valley agriculture statistics, according to the imperial county farm bureau 500k acres are farmable, of which nearly half are alfalfa and bermuda grass (aka lawn grass).[1]

Would be interesting if someone knowledgeable in this area could comment on water consumption of these vs impact to other food chains, as well as alternatives such as growing it elsewhere and transporting to where livestock that eats it is.

[1]https://www.icfb.net/imperial-valley-agriculture