CFR › Title 21 › Part 556 › §556.58021 CFR §556.580Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)[Reserved](b)Tolerances. The tolerances for robenidine are:(1)Chickens.(i)Skin and fat: 0.2 ppm.(ii)Other edible tissues (excluding eggs): 0.1 ppm.(2)[Reserved](c)Related conditions of use. See § 558.515 of this chapter.