556.510—Penicillin.
         Tolerances are established for residues of penicillin and the salts of penicillin in food as follows:
    
    
    
        
        (b) 
         Zero in the uncooked edible tissues of chickens, pheasants, quail, swine, and sheep; in eggs; and in milk or in any processed food in which such milk has been used.