It is terrible scene.

I was shocked at the footage showing pigs culled by farmers for containing foot and mouth disease.  Over millions of livestock have been culled for that disease.

I'm very furious about the way the authority handles with it. Should the animal be killed while still alive?

Why didn't the authority apply euthanasia for them?
I watched intently at the eyes of the pigs and cows alive when they just was being buried alive. I feel so terrible about that. Even though the disease could affect the lives of people who live on livestock, the animals have also rights to live on their soil.
No one has any rights to kill any creatures on earth.