What are the symptoms of laying hen respiratory disease?

The common clinical diseases that endanger chicken respiratory tract include chicken infectious rhinitis, chicken infectious bronchitis, chicken infectious laryngotracheitis, Newcastle disease, avian aspergillosis, and chicken chronic respiratory disease caused by mycoplasma infection. It can cause respiratory symptoms in chickens, and clinical symptoms should be noted. The symptoms of various laying hen respiratory diseases are as follows:

Symptoms of avian aspergillosis: Avian aspergillosis is a variety of avian fungal diseases caused by aspergillus in the fungus, mainly affecting the respiratory organs. All kinds of birds are susceptible, but young birds are common and acute and mass outbreaks are common. The morbidity and mortality are relatively high. Adult birds are mostly sporadic. The disease is characterized by inflammation of the lungs and air sacs and the formation of granuloma. The size of the millet is mainly grey or yellow nodules, which must be distinguished from Mycoplasma gallisepticum. Besides, nodules are occasionally found in tissues such as eyes, liver, and brain, so they are also called aspergillus pneumonia.

. Symptoms of Mycoplasma gallisepticum: Mycoplasma gallisepticum is a contagious chronic respiratory disease of chicken caused by Mycoplasma gallisepticum. After the onset of disease, the sick chickens first shed serious or viscous nasal fluid and squirted their nose. When the inflammation continues to develop, they cough and have difficulty breathing. Breathing rales can be heard. In the later period, a large amount of exudate accumulates in the nasal cavity and suborbital sinus, and eyes The face is swollen and the eyes are prominent. The nasal cavity, trachea, bronchus, and air sacs contained mucous exudates during the necropsy. The characteristic lesions were body air sacs, especially chest air sacs, with varying degrees of turbidity, thickening, and oedema. A large number of air sacs varied in size as the disease progressed. Caseous hyperplastic nodules, rosary-like in appearance, a few are as large as eggs, and some have lung lesions. In chronic cases, there are yellow exudates in the eyes of sick chickens, and grey-yellow tofu-like substances in the conjunctiva. Clinically, it should be distinguished from other respiratory diseases.