Leucomycin (Kitasamycin) is a macrolide antibiotic, obtained by fermentation of Strepeomyces kitasatoensis hata. It can be used to treat respiratory diseases of livestock and poultry. Similar to erythromycin. It has strong antibacterial effect on GRAM-positive bacteria and mycoplasma, and is also effective on some GRAM-negative bacteria, Leptospira, Rickettsia and chlamydia. It can be used as feed additive for pigs and chickens in small dose and has the function of promoting growth. It is mainly used for the treatment of pertussis, pneumonia, bronchitis, tonsillitis, otitis media, gonorrhea, gonorrhea urinitis and other diseases.