Section 556.640 - Sulfadimethoxine(b)Tolerances. The tolerances for sulfadimethoxine are:(1)Catfish and salmonids. Edible tissues: 0.1 ppm.(2)Cattle.(i) Edible tissues (excluding milk): 0.1 ppm.(3)Chickens, turkeys, ducks, and chukar partridges. Edible tissues (excluding eggs): 0.1 ppm.(c)Related conditions of use. See §§ 520.2220a , 520.2220d , 520.2220e , 522.2220 , and 558.575 of this chapter.