Possible Mechanism Involved in the Growth-Promoting Responses Obtained from Antibiotics

Abstract
Data presented in this report show that the administration of an antibiotic produced a significant increase in growth and a significant decrease in the total number of clostridia per gram of feces. Earlier reports are confirmed to the effect that penicillin, aureomycin, bacitracin, and terramycin stimulated the growth of chicks. Arsanilic acid and sodium arsanilate have been shown to increase growth and decrease the total number of clostridia per gram of feces when fed to chicks.