Section 556.283 - Florfenicol(a)Acceptable daily intake (ADI). The ADI for total residue of florfenicol is 10 [MICRO]g/kg of body weight per day.(b)Tolerances. The tolerances for florfenicol amine (marker residue) are:(1)Cattle.(i) Liver (target tissue): 3.7 ppm.(2)Swine.(i) Liver (target tissue): 2.5 ppm.(3)Catfish. Muscle (target tissue): 1 ppm.(4)Freshwater-reared warmwater finfish (other than catfish) and salmonids. Muscle/skin (target tissue): 1 ppm.(c)Related conditions of use. See §§ 520.955 , 522.955 , 522.956 , and 558.261 of this chapter.81 FR 17608, 3/30/2016; 84 FR 32993, 9/9/2019