single oral dose for example in a therapeutic treatment 5 25 by weight of the drug may be mixed with 4 25 by weight of hydroxystearin and 90 50 by weight of sesame oil this formulation is administered by a syringe as an oral paste and will provide about 250 mg of drug per cubic centimeters cc it is of course obvious that a higher concentration of the drug can be achieved by altering the quantities of drug and sesame oil accordingly for prophylactic administration the active ingredient is preferably administered either in the feed or in the drinking water at levels of from about 100 to about 1000 parts per million and preferably at levels of from 200 to 500 parts per million this treatment is usually effective when administered over about a one to three week period although the treatment period may be extended if so desired for prophylactic or therapeutic treatment of swine via feed treatment any conventional swine feed may be employed and a typical feed is described in example 1 below as indicated above the active ingredient is normally administered to the swine intimately mixed in the feed ration or drinking water for prophylaxis the drug can be suitably prepared as a premix or feed supplement containing from about 1 to about 90 by weight of the formulation which can also contain various diluents or carriers carriers suitable for use to make up the feed supplement compositions include the following soybean meal alfalfa meal cotton seed oil meal cornmeal cane molasses urea bone meal corncob meal dried fermentation whole harvest mash solids.