Section 556.765 - Zilpaterol(a)Acceptable daily intake (ADI). The ADI for total residue of zilpaterol is 0.083 [MICRO]g/kg of body weight per day.(b)Tolerances. The tolerance for zilpaterol freebase (marker residue) is:(1)Cattle.(i) Liver (target tissue): 12 ppb.(c)Related conditions of use. See § 558.665 of this chapter.84 FR 32993, July 11, 2019, as amended at 85 FR 18121, Apr. 1, 2020 81 FR 17608, 3/30/2016; 84 FR 32993, 9/9/2019; as amended at 85 FR 18121, 4/1/2020