Graphic video has prompted McDonald's to cut ties with one of its chicken suppliers

Picture unrelated to story

Huffington Post  Chickens cruelly beaten, stomped to death and left to die painfully and slowly. According to Mercy For Animals, that’s the “disgusting secret” behind McDonald’s Chicken McNuggets.

On Wednesday, the advocacy group released disturbing hidden-camera footage capturing what it says is evidence of abusive practices at a McDonald’s chicken supplier.

The investigation into T&S Farm, located in Dukedom, Tennessee, “exposed horrific cruelty to animals, including birds beaten, crammed in filthy sheds, stabbed to death with nails attached to makeshift clubs and left to suffer and slowly die without proper veterinary care,” the group wrote.

The farm had likely supplied chicken for McDonald's Chicken McNuggets, McChicken sandwiches and grilled and deep-fried chicken filets, according to The Associated Press.

Watch the video below. Be warned that it contains graphic footage: