 Story highlights An undercover video by an animal rights group shows mistreatment to cows 
 
 The owner of a 30-year-old family dairy fires five workers 
 
 Three of the workers are charged with misdemeanor animal cruelty 
 
 The dairy provides milk to a supplier of Kraft Foods 
 
 Five workers at an Idaho dairy have been fired after an undercover video by animal rights activists showed mistreatment towards cows, the dairy owner said. (Mercy For Animals / ) 
 
 An Idaho dairy farm linked to Burger King, In-N-Out and other food companies has been accused by an animal rights group of “some of the most abusive treatment of animals” it had ever seen. The Murtaugh, Idaho, dairy works with cheese producers and suppliers, which in turn have deals with fast-food chains. The Idaho Department of Agriculture informed the dairy of the tape about five weeks ago, and Bettencourt fired all the individuals filmed in the mistreatment, he said. Three Bettencourt workers now face misdemeanor animal cruelty charges, which were filed in August, according to Twin Falls County Prosecutor Grant P. Loebs. Luis Bettencourt, owner of Bettencourt Dairies, told CNN his family-owned operation of 30 years was "appalled" at the video -- which the Mercy for Animals group says depicts workers and supervisors "violently hitting, stomping on, punching and kicking cows in the face and body." “Because of our commitment to our dairy herd, animal abuse or misuse has a zero tolerance policy and is dealt with as swiftly as possible.” 
 
 All dairy employees were required to watch the video and to sign and acknowledge the animal treatment policy, according to the statement. "Burger King Worldwide does not have a direct relationship with Bettencourt Dairies," Thornton said. As part of our animal welfare commitment, we require that all suppliers and their vendors adhere to our vendor code of ethics.” 
 
 Burger King said Bettencourt “may be an indirect supplier of a small percentage of cheese products to Burger King restaurants in the U.S.” The company said it has launched an “immediate investigation.” 
 
 “The portrayal of the Burger King brand in this attack is irresponsible and does not accurately reflect the company’s commitment and actions on issues relating to animal welfare,” the company said.
– Yet another tough-to-stomach video is out detailing the abuse of animals in the fast-food industry, this time at a huge dairy farm in Idaho. The video by Mercy for Animals shows workers at Bettencourt Dairies punching, kicking, dragging, and stomping on cows, reports the Miami Herald. Because Burger King gets some of its cheese from the dairy, the group singled out the chain: “The secret ingredient in Burger King’s cheese is horrific animal abuse,” says its director. “No socially responsible corporation should support dairy operations that beat, kick, mutilate, confine and neglect animals.” The Humane Society called the video "reprehensible," but did not gang up on Burger King, asserting that it has done more to improve animal welfare over the last decade than any other restaurant chain. BK, meanwhile, promises to take quick action. The dairy immediately fired five workers, three of whom face animal cruelty charges, and made all of its workers watch the video and sign a zero-tolerance policy on animal cruelty, reports CNN. "We are all devastated by it," says the owner. "We are family-owned and we love our cattle." The dairy supplies other big names, including In-N-Out Burger and Wendy's, notes the Los Angeles Times.