How to prevent and treat goose flu? These methods must be mastered
Epidemiology
Goose influenza, abbreviated as goose flu, is an acute systemic or respiratory infectious disease caused by certain pathogenic serotype strains of type A influenza virus, occurring mainly in goslings within 30 days of age. In recent years, the incidence of goose flu has gradually increased, mostly due to sudden climate changes, poor feeding and management, and goslings catching cold and becoming infected. The mortality rate is generally 50%-90%.
Clinical symptoms
The acute type is most common; affected geese suddenly fall ill, with depression, ruffled feathers, drooping wings, and elevated body temperature, and reduced food intake or loss of appetite; red eyes and tearing, with some geese developing unilateral or bilateral corneal opacity, and blindness in severe cases; some geese have a runny nose or discharge bright red blood; the legs become weak, standing is unsteady, and they are unwilling to move; some geese show neurological symptoms such as swelling of the head and neck, tilted head and wry neck, and circling in water; some sick geese develop prolapsed cloaca, and egg production drops by 20%-50%. They pass yellow-white or yellow-green watery loose droppings. The course of the disease is generally 2 days to 4 days.
Anatomical changes
The nasal mucosa, conjunctiva and nictitating membrane are congested and hemorrhagic, the cornea is grayish-white and cloudy, and the nasal cavity is filled with blood-tinged mucous secretions; the larynx and trachea are congested and hemorrhagic; grayish-white necrotic spots appear in the myocardium; the liver is enlarged and brittle; the spleen is enlarged and prominent, with erosive grayish-white spots on the surface; the pancreas shows spotted hemorrhage and transparent or white focal necrosis; the intestinal membrane shows focal patchy hemorrhage or hemorrhagic ulcers; the ovarian follicles are congested with patchy necrosis. In cases with head swelling, gelatinous edema can be seen in the subcutaneous tissue of the head and lower jaw.
Prevention and control measures
Prevention
(1) Carry out scientific feeding and management, improve feeding and management conditions, keep the goose house dry and ventilated, and at the same time pay attention to keeping goslings within 1 month of age warm.
(2) Do a good job of environmental sanitation, and effectively disinfect the goose house, @#@232@#@ equipment and ground; first clean, then choose effective disinfectants such as 2%-5% NaOH, 0.1%-0.2% peracetic acid, etc., for thorough disinfection.
(3) In areas where the disease is common, use inactivated avian influenza oil-emulsion vaccine for prevention. For the first vaccination, when goslings are 7 days to 10 days old, inject multivalent inactivated avian influenza vaccine subcutaneously at the lower 1/3 of the neck, and inject once again after 15 days. Breeding geese are given the second vaccination at 60 days of age, the third vaccination 15 days to 20 days before laying, and thereafter once every six months when the flock stops laying.
Treatment
(1) Avian influenza antiserum or multivalent ultra-high-immunity yolk antibody, combined with interferon and interleukin, can enhance the resistance of geese and improve nonspecific immune function, repair damaged immune cells and tissues, and help recovery. The effect is relatively ideal when used in the early stage of the disease, and it can often control the development of the outbreak and reduce deaths.
(2) Choose good-quality drugs to reduce stress in affected geese. To control secondary bacterial infection and prevent complications, the following can be selected: Jinguangzhen combined with Banlangen and Dexamethasone for intramuscular injection; Suxiao Nangbingning, Jinguang Huluba, and Weiduoli mixed with water for affected geese to drink freely.
(3) During treatment, sick geese should be isolated for treatment, and disinfection with the geese should be strengthened to reduce the concentration of influenza virus in the flock, promptly clear away dead geese, and reduce stocking density.