I'm not buying the plowing under stories, except maybe in places where it costs money to irrigate.
Maybe deep South and CA, where they may have crop in the ground all winter too - They would have to be harvesting now-ish to get a spring crop planted... But that can only be deep South... I know that Kansas, Oklahoma, Missouri latitudes are laying fallow in the winter, or growing a cover - Annual rye, or winter wheat to harvest in the spring and plow under... That's touchy because most of the Plains is too wet to harvest this time of year. Normally they're beggin to dry off so they can get a plow in the ground. But I am a Northerner, and I don't know for sure.
I'm thinking of the cattlemen and pig farmers. They either feed 'em or slaughter 'em if they can't get a wholesale buyer.
Pigs, yeah... They're basically a feed lot animal, or a pasture animal at best. That means feed costs and lost production. If you don't harvest em, they keep costing you money and you didn't get money from the harvest you missed.
Dairy, same kinda thing... Pasture critters are supplemented,, so they cost you money all the time. And you need to keep your cows wet (in milk). If you let em dry off, they're dry till the next time they calve... And still costing you money all year. So that's tough.
But range don't care. Cattle are different from Dairy. They go to range basically for free (unless a head lease on gubmint land) The spendy time is in the winter when they are drove down, sold for slaughter, and the rest wintered over on pasture. The profit from the fall harvest breaks even generally, getting you through the winter costs in hay and grain to your pregnant cows and yearling calves, with gravy money coming on yearling calves in the spring and late calves from the year before going to sale.
They go to the feed lots, which act as a buffer. The live harvest on the hoof (spring and fall generally) is fed in the lots and taken to slaughter as needed in between. So the feed lots set the price of the live hoof.
Yeah, the feed lots might be taking a hit. Can't move em, and have to feed em. But that means live hoof is cheaper than dirt, and ranchers can expand breeding herd right now for near nothing... SO the net effect is growing herds out on the range.
The bummer comes in the fall - The fall harvest time you HAVE TO get rid of overage - pare down as much as you can or suffer haying them all winter long, which is likely. You can sell em off the pasture in the winter, but beef prices are low as all heck in the winter, so pretty much you are screwed into feeding em if you don't get em sold off...