1. How to diagnose Newcastle disease in chickens? If the chickens have the characteristics of obviously reduced food intake, dyspnea, loose green feces and obviously reduced egg production of adult hens, we should consider whether they are infected with Newcastle disease. Because there are many diseases in chickens and poultry, some diseases are similar to the above characteristics, such as chicken kidney-type branching and bursa of fabricius. Therefore, the diagnosis of Newcastle disease needs clinical autopsy. If the symptoms of gastrointestinal bleeding, necrosis and ulcer in chickens can be preliminarily diagnosed, virology test is needed for further diagnosis.
Second, the prevention of Newcastle disease For this epidemic with high mortality, chicken farms must take precautions to avoid huge economic losses. The prevention of Newcastle disease is a comprehensive work, which is not only as simple as vaccination, but also needs to be paid attention to from health management, disinfection and sterilization, immunization and monitoring.
1, strict management is required to prevent germs from entering the chicken farm. The main source of Newcastle disease infection is the feces and mucus of infected chickens. These viruses may enter the chicken farm through personnel, feed and chicken farm equipment, so the chicken farm should be strictly disinfected.
2. Improve the immunity of chickens. Chickens with high health level have strong immunity to epidemic diseases and low infection degree. Therefore, it is necessary to strengthen the health of chickens in feeding management and pay attention to their diet and range of activities.
3. Reduce the spread of epidemic diseases. Newcastle disease virus can be transmitted through diet, air and contact. In order to reduce the spread of the disease, on the one hand, we should pay attention to the timely cleaning of chicken manure and environmental sanitation, on the other hand, we should pay attention to the daily disinfection of chicken farms.
4. Vaccinate chickens. At present, the common epidemic prevention methods of Newcastle disease in chickens are that chickens aged 5-7 days are inoculated with the new branch of H 120 nasal drops for the first time, and then vaccinated with H52 vaccine at 50 days.
Third, the treatment of Newcastle disease Once chickens are infected with Newcastle disease, there is no obvious therapeutic effect at present. Therefore, sick chickens that have already become ill should be treated in accordance with the provisions of the Law on Animal Epidemic Prevention. First, chicken farms should be strictly blocked to prevent the spread of the virus, and all chickens should be sterilized. Contaminated chicken feathers, forage and feces should also be burned or buried deeply.
Chickens in the incubation period without obvious symptoms can be treated by injecting Gankang polypeptide (Tianyu Bio) mixed drinking water with sword beans, and each bottle is used for 1 1,000 adult birds and 2,000 young birds. Note: The incubation period of Newcastle disease is short and acute, with an average of 5-6 days, with an incubation period of 2- 15 days. Therefore, once an epidemic situation occurs in a chicken farm, it must be dealt with quickly and treated in isolation in time.