Common Poultry Disease Prevention - Chronic Respiratory Disease

(1) Epidemiology and Symptoms Chickens of all ages can be infected, and the incidence of chickens at 3 months of age is high. Adult chickens can be transmitted to chicks through eggs. The disease can occur throughout the year, but early spring in the early winter is more common, the epidemic is slow. Poor feeding and management, cold chicken house, too dry, crowded chickens, climate change, and Newcastle disease, infectious bronchitis and other factors are easy to stimulate the disease. The sick chicken sneezes, wheezes, and has a fluid or mucus nose that can be heard. Chickens grow stagnant and gradually lose weight. If the exudate accumulates in the nasal cavity and infraorbital sinus later in the later period, swelling of the eyelids may occur and the eye may protrude like a knob. The disease generally develops slowly. Diseases can last for more than 3 months. The mortality of young chickens can reach 62%. (b) pathological changes nasal cavity, trachea, bronchial mucus leakage, tracheal mucosa thickening. The changes in the chest and abdomen airbags were obvious. In the early stage, the airbags were slightly turbid and the surface had hyperplastic lesions. As the disease progressed, the airbags became thicker, with yolk-like yellow-white exudates. The swollen eyes were able to extrude yellow-white. clot. Escherichia coli secondary to prone to cause hepatic inflammation, pericarditis, peritonitis and salpingitis. (C) diagnosis based on the age of onset of the disease, epidemic, long duration, low mortality, clinical manifestations of asthma and sound, combined with typical balloon lesions can make a preliminary diagnosis. During the diagnosis process, attention should be paid to the differences between infectious bronchitis, Newcastle disease, infectious rhinitis, and Vitamin-deficiency syndrome. If necessary, laboratory serological tests should be conducted. China Agricultural Network Editor

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