The owner of Rancho Feeding Corporation, Jesse “Babe” Amaral, Jr., plead guilty on Wednesday to an array of charges stemming from a scheme he and two other workers hatched to sell cows with eye cancer and deceive federal inspectors from 2012 to 2014. Mr. Amaral, 77, and his two workers, Eugene Corda, 66, and Felix Cabrera, 56, were accused of selling meat condemned by a United States Department of Agriculture veterinarian, as well as concealing from inspectors cows with symptoms of eye cancer by carving “U.S.D.A. Condemned” stamps out of cattle carcasses and by switching diseased heads with healthy heads. Mr. Amaral also admitted to fraudulently invoicing farmers, constituting mail fraud—which carries much higher penalties. An associate of Mr. Amaral’s, Robert Singleton, 78, plead guilty to similar charges last August; Mr. Amaral’s two workers plead guilty over the fall. According to the United States Department of Justice, the penalties for conspiring to distribute adulterated meat are a maximum five years’ imprisonment, three years’ supervised release, a $250,000 fine and a $100 special assessment; for fraudulent distribution of adulterated meat, the penalties are an additional maximum three years’ imprisonment, one year supervised release, a $10,000 fine and $100 special assessment; and for mail fraud, they are a maximum of 20 years’ imprisonment, three years’ supervised release, a $250,000 fine and $100 special assessment. Mr. Amaral’s sentencing hearing is scheduled for July 1 in San Francisco. Last February, 8.7 million pounds of meat were recalled by the U.S.D.A.; that same month, the defunct Rancho Feeding Corporation slaughterhouse was purchased by Marin Sun Farms C.E.O. Dave Evans. It reopened in April.