A Comparison of the Effect of Aureomycin in Combination with Three Levels of Sulfamethazine in Feed for the Control of Cecal Coccidiosis of Chickens

GARDINER (1957) reported that young chickens kept in wire cages and inoculated experimentally with large numbers of sporulated oocysts of Eimeria tenella (1) did not die from cecal coccidiosis when fed growing mash medicated with sulfamethazine at a level of 0.125 percent, and (2) made weight gains equal to or somewhat better than uninfected control birds when aureomycin was added to the sulfamethazine-medicated mash at the rates of 100 and 200 grams per ton. In the above-mentioned investigation, the amount of sulfamethazine included in the feed was kept constant, whereas the amount of aureomycin was varied. The present paper summarizes results of experiments in which birds were fed growing mash fortified with a constant amount of aureomycin, namely, 200 grams perton, and medicated with sulfamethazine at levels of 0.125, 0.075, and 0.050 percent. EXPERIMENTAL PROCEDURE The chicks used in these experiments were New Hampshire-Barred Rock crosses. They were obtained from . . .