§ 520.2200a - Sulfachlorpyridazine bolus.

(a) Chemical name. N′-6-(Chloro-3-pyridazinyl) sulfanilamide.

(b) Specifications. Melting point range: 190 °C to 191 °C.

(c) Sponsor. See No. 053501 in § 510.600(c) of this chapter.

(d) Related tolerances. See § 556.630 of this chapter.

(e) Conditions of use. It is used in calves as follows:

(1) Amount. 30 to 45 milligrams per pound body weight per day.

(2) Indications for use. Treatment of diarrhea caused or complicated by E. coli (colibacillosis).

(3) Limitations. Administer in a bolus containing 2 grams of sulfachlorpyridazine for 1 to 5 days in divided doses twice daily; treated calves must not be slaughtered for food during treatment or for 7 days after the last treatment. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal.