This is a typical example of fascism in action, where the gov is used as a weapon by an industry:

One farmer who raises pigs of a breed resistant to cold weather is being sued by a Federal agency that claims his pigs are "feral", an "invasive species" that can't be allowed to be raised because they carry diseases.

This farmer fights for his livelihood and appeals to people's financial support to pay legal bills because if he loses, it's a precedent that will be used to shut down all other family farms that raise rare breeds of animals.

Biodiversity is a way for Nature to preserve a species in case a breed is wiped out by a disease or external conditions, then another breed may survive.
But the Fed only wants the pink pig variety, the one that is raised in concentration camps by Big Agro.