CYDECTIN Pour-On for Beef and Dairy Cattle has changed the way parasites in cattle are controlled. Cattle treated with Cydectin can easily be recognized by a purple streak on their back, which remains for a short period of time after treatment. Cydectin also features no slaughter withdrawal or milk withholding when used according to label directions - 1 ml. per 22 pounds of body weight. This means treated cattle may be used for human consumption any time following treatment. Cydectin controls roundworms, lungworms, lice, grubs, horn flies and mites. It controls the brown stomach worm (Ostertagia ostertagi) for 28 days and the Dictyocaulus viviparus lungworm for 42 days after treatment.