Dried Streptomyces aureofaciens Fermentation Product contains Chlortetracycline (CTC). Chlortetracycline is broad-spectrum antibiotic active against gram-positive bacteria, gram-negative bacteria, Rickettsia, Chlamydia, Mycoplasma, Spirochaetes and also some protozoa. It is widely used for an increased weight gain and improved feed efficiency, highly effective in prevention and treatment of bacterial enteritis and respiratory diseases in pigs, poultry and cattle.