How to Control Avian Influenza in Black Chicken

(1) pathogenic influenza A virus.

(2) the black chicken is susceptible to epidemic characteristics, and geese can also be infected. Duck may be the main host of influenza virus, and the fatality rate varies with different strains. The mortality rate of some chicken farms is 10% Mel 40%. Most laying hens only show a decline in egg production, with a mortality rate of no more than 2%. The mortality rate of mature hens is higher than that of laying hens.

(3) symptoms and pathological changes, depressed spirit, high fever and refusing to eat. The diseased chicken soon fell into a lethargic state, with swollen eyelids, bleeding from the crown and fleshy flesh, cyanosis, frequent edema in the head and neck, purple bleeding spots on foot scales, respiratory symptoms, coughing, sneezing, rales in the trachea, tears, swelling of paranasal sinuses and dysentery, and egg production decreased by 15% and 70%. Autopsy showed edema in the head, around the heel, dropsy of the flesh, subcutaneous yellow gelatinous fluid, bleeding spots in chest muscle and fat, hemorrhage in oral cavity, glandular gastric mucosa, substratum corneum and duodenum, hemorrhage and necrosis in liver, spleen and kidney, bleeding in nasal cavity, trachea, bronchial mucosa and lung, mucus and blood in larynx and trachea. The diagnosis can be confirmed by Agar diffusion test for avian influenza antibody and virus isolation and identification. According to the regulations, the diagnosis of bird flu can only be carried out by the provincial animal husbandry authorities.

(4) there is no specific treatment for prevention and treatment at present. The application of antimicrobial therapy can reduce the effect of complicated or secondary infection of mycoplasma and Escherichia coli and reduce the loss. It is also reported that amantadine has a certain curative effect. In the event of an epidemic, the movement of chickens should be strictly blocked and controlled, and strict disinfection measures should be taken. At ordinary times, the hygiene management of chicken flocks should be strengthened, and breeding eggs and black chickens should not be introduced from epidemic areas.