Prevention and Control Methods and Technical Key Points for Chronic Respiratory Disease in Chickens

1. Improve the rearing environment, pay attention to insulation, prevent overcrowding, and maintain air circulation inside the coop.

2. Practice all-in/all-out management and regularly carry out spray disinfection of the chickens' bodies.

3. Trial use of vaccines for prevention: broiler chickens can be vaccinated with attenuated mycoplasma vaccine, and breeding chickens can be vaccinated with oil-emulsion inactivated mycoplasma vaccine, with one vaccination at 10 days of age and one before the start of laying.

4. Drug prevention and control. Planned administration of medication for prevention and control is still the key to controlling this disease at present, among which prevention is the most important. If treatment is only carried out after the disease has already occurred and spread or become severe, the results will not be ideal.

(1) Principles of medication use.

① Medication should be administered during the first three days after chicks hatch, with the aim of controlling pathogens brought by contaminated hatching eggs, and medication should be administered immediately for 1 to 2 days whenever there are stress factors (such as vaccination, beak trimming, transfer between pens, and sudden climate changes).

② The choice of drugs can be comprehensively considered according to the chickens' age in days, economic cost, and the need to prevent other diseases. For example, if chicks are young and the dosage is small, a slightly more expensive drug can be used, such as Pusaping, which can also prevent and control pullorum disease while preventing this disease.

③ Because mycoplasma and Escherichia coli easily develop drug resistance, the same drug cannot be used for a long time. The dosage must be sufficient, and the course of treatment must be long (3 to 5 days).

(2) Commonly used drugs.

① Macrolides: Gaolimixian (erythromycin), Tainong (tylosin), kitasamycin, lincomycin.

② Tetracyclines: doxycycline, oxytetracycline, tetracycline, chlortetracycline.

③ Aminoglycosides: streptomycin, gentamicin, kanamycin, Zhibaiyan (spectinomycin).

④ Quinolones: Pusaping, Kejunling (norfloxacin, fluoroquinic acid), Jinlida (pefloxacin mesylate), ofloxacin, sarafloxacin, difloxacin.

⑤ Compound preparations: Qingpusheng (lincomycin + spectinomycin), Special Avian Bacterial Purifier.