Mainly used for the prevention and treatment of livestock pneumonia (caused by Actinobacillus pleuropneumoniae, Pasteurella, mycoplasma, etc.), avian mycoplasma disease and mastitis in lactating animals. It has inhibitory effect on gram-positive bacteria, some gram-negative bacteria, mycoplasma, spirochetes, etc.; it has stronger antibacterial activity than tylosin on Actinobacillus pleuropneumoniae and Pasteurella.