Duck viral hepatitis is a rapidly spreading and highly fatal infectious disease caused by the duck hepatitis virus in young ducks. It is characterized by enlarged liver with bleeding spots and neurological symptoms. In the new endemic areas, the mortality rate of this disease is very high, reaching more than 90%.
Popular features
The disease mainly occurs in 4- to 20-day-old ducks, adult ducks are resistant, chickens and geese can not naturally develop the disease. Sick and poisonous ducks are the main source of infection, mainly through the digestive tract and respiratory tract. Poor feeding management, lack of vitamins and minerals, and wet and crowded duck houses can contribute to the occurrence of the disease. The disease occurs during the hatching season and, once it occurs, spreads quickly among the chicks, with an incidence of up to 100%.
The disease is mainly infected with ducks under natural conditions, not infected with chickens and geese, all year round, different breeds, genders of ducks can be infected, healthy ducks through contact with the diseased and toxic hepatitis duck and poisoned duck contaminated with feed, water, mat grass, vehicles and other infections and epidemic disease, but also through gastrointestinal and respiratory tract infection, the incidence and mortality rate of young ducks are high, the mortality rate of young ducks within 1 week of age can be as high as 95%, and ducks over 1 month of age rarely die of illness. Poor feeding management, lack of vitamins and minerals, wet duck houses, and crowded ducks can contribute to the occurrence of the disease.
What are the symptoms of duck viral hepatitis?
Profiling can reveal characteristic lesions in the liver. Hepatomegaly, yellowish red or spotted, with bleeding spots and bleeding spots on the surface, gallbladder enlarged, full of bile. The spleen is sometimes enlarged and looks like a patch on the liver. Most kidneys are congested and swollen. The heart muscle is cooked. Some cases include pericarditis, yellowish exudate in the air sacs, and cellulose flacings.
Liver edema, and many needle tips as large as soybean grains bleed. The gallbladder is large and full of bile. Microscopic observation shows that hepatocytes are vacuolar at the beginning of infection, and then lesion necrosis occurs in the later stages, and the central nervous system may have vascular sheath phenomenon. The spleen is enlarged and mottled. The kidneys are swollen, the blood vessels are pronounced, and they are dark purple in the form of branches.
How to prevent viral hepatitis in ducks?
(1) Inject the immune egg yolk homogenate, and inject 1 ml under the skin of each duck.
(2) Injection of duck virus hepatitis high immune serum, each duck muscle or subcutaneous injection of 0.3 ~ 0.5 ml.
(3) Inject the serum of the recovered duck, inject 0.5 ml per duck muscle or subcutaneously within 10 days of age, and inject 1 ml per duck at 10 to 20 days old. Injection of duck viral inactivated vaccine 0.5 to 1.0 ml.
(4) Drink water with 0.01% virazole and 0.01% enrofloxacin, and add electrolytic multidimensional dilution several times to the drinking water for 3 to 5 days.