Animal rights group Mercy for Animals has released hidden-camera video allegedly showing instances of animal abuse at pork producer Christensen Farms, one of the largest pork producers in the nation and a supplier of pork to Walmart. The video, taken at a farm in Hanska, Minn.,  is narrated by Bob Barker and shows pregnant sows in gestation crates and piglets being slammed into the ground and having their tails and testicles cut off without painkillers.

Mercy for Animals has called for WalMart to adopt new animal welfare guidelines that prohibit the use of gestation crates. The crates are legal, though more food suppliers are changing their welfare guidelines to prohibit or phase out their use. Kmart and Costco have announced such changes after speaking with MFA officials and viewing the video.