For the treatment of gram-positive bacteria and mycoplasma infections. Long-term low-dose addition in livestock and poultry feeds can improve feed rewards, promote animal growth, and increase weight gain, thereby shortening the feeding cycle. Among them, the feed remuneration of chickens can be increased by 4.5 to 12.5%, and the weight gain rate can be increased by 4.5 to 15%; the feed remuneration of pigs can be increased by 11 to 25%, and the weight gain rate can be increased by 11 to 15%. Adding high doses to livestock and poultry feeds can prevent and treat swine dysentery, colitis, ileitis, necrotizing enteritis, maintain body weight in the event of atrophic rhinitis, and reduce diarrhea and edema caused by Escherichia coli in newborn and weaned piglets It can control the incidence of swine asthma and chronic respiratory disease in chickens caused by mycoplasma infection, reduce the stress response of livestock and poultry, and prevent and treat the secondary infection of sensitive bacteria in livestock and poultry after outbreaks of viral diseases.