Florfenicol, doxycycline and Tilmicosin are the three drugs commonly used in the treatment of poultry respiratory diseases, the treatment of poultry respiratory diseases, florfenicol, doxycycline and tilmicosin these three Veterinary drugs, is also the first choice for the treatment of poultry respiratory diseases. The reasons are as follows: First, in the treatment of respiratory diseases, the dosage of these three drugs is the largest proportion; Second, as long as there is no deviation from the disease and the accuracy of the drug administration, its therapeutic effect is OK. Many of the use of these three veterinary APIs, in fact, is to expand the amount of water or mix In the treatment of poultry diseases, "florfenicol + Tilmicosin" or "florfenicol + doxycycline" are often used together. 1. Tilmicosin is a narrow-spectrum antibiotic drugs, while florfenicol is a broad-spectrum antibiotic. 2. The resistance of Tilmicosin to mycoplasma is stronger than that of florfenicol, but the resistance of Tilmicosin to gram-negative bacteria such as Eschericol and Salmonella is much weaker than that of florfenicol. 3.doxycycline and florfenicol compared, although both are broad-spectrum antibiotics veterinary, doxycycline is more effective against unconventional bacteria than florfenicol. In the treatment of mycoplasma-induced respiratory tract, for better efficacy, the three can be used together: "florfenicol + doxycycline (doxycycline hyclate) + Tilmicosin" if combined with a Maxingshigan oral liquid, the effect will be better.