 In 2006 , PETA went before Burger King 's board of directors during its parent company 's annual corporate meeting to request that poultry suppliers switched to a more @-@ humane method of slaughter called controlled atmosphere killing ( CAK ) . Instead of using its previous tactic of stating that the procedure is more humane , the group claimed that CAK was economically more feasible as it reduces the chances of injury to workers in poultry factories and it produces better products by preventing injury to the animal . Responding to the proposal in March 2007 , Burger King announced it would make further changes to its animal @-@ welfare policies . The new policies favor suppliers of chickens that utilize CAK rather than electric shock to knock birds unconscious before slaughter , and require its pork and poultry suppliers to upgrade the living conditions of pigs and chickens . Under the agreement , 2 % of BK 's North American egg suppliers are to use cage @-@ free @-@ produced eggs and 10 % of pork suppliers are to use crate @-@ free pigs for its pork products . PETA and the Humane Society of the United States were quoted as saying that Burger King ’ s initiatives put it ahead of its competitors in terms of animal rights and welfare and that they were hopeful that the new initiatives would trigger reform throughout the fast food industry as a whole . 
