ConAgra Foods Inc., one of the nation’s largest packaged foods companies, said Monday it is urging its poultry suppliers to consider slaughtering chickens in a way the People for the Ethical Treatment of Animals calls more humane.

The letter a ConAgra vice president sent to suppliers on June 29 doesn’t mention PETA, but it uses some of the same arguments the animal-rights group uses to lobby for using “controlled-atmosphere killing.”