Section 556.428 - Narasin(a)Acceptable daily intake (ADI). The ADI for total residue of narasin is 5 [MICRO]g/kg of body weight per day.(b)Tolerances. The tolerance for narasin (marker residue) is: (1)Chickens. Abdominal fat (target tissue): 480 ppb.(c)Related conditions of use. See §§ 558.363 and 558.364 of this chapter. 83 FR 64741 , 12/18/2018; 84 FR 32993 , 9/9/2019