How to prevent pathogenic Avian Influenza in large Poultry Farm

Poultry farm

Highly pathogenic avian influenza (HPAI) is an infectious disease caused by influenza A virus in birds with a variety of symptoms from respiratory system to severe systemic septicemia. it has a short incubation period and rapid morbidity. Winter is the season with high incidence of avian influenza. Large-scale poultry farms should take the following main measures to prevent avian influenza:

First, strictly implement and improve the regular biosafety measures of breeding farms.

First, isolation zones are set up between the three major functional areas: living areas, production areas and polluted areas, and strict disinfection is carried out.

Second, poultry farms must be managed in a closed manner, and breeders must live in poultry farms. Production personnel, including breeders, feed allocators and veterinarians, should enter the production area and wear work clothes and work shoes and caps, work clothes and work shoes and caps should be cleaned and disinfected frequently and must not be worn out of the production area.

Third, a disinfection pool should be set up at the gate of the site, which should be managed by special personnel, and the disinfection pool should be replaced and replenished regularly to maintain the disinfection concentration, and supervise the disinfection of entry and exit personnel and vehicles.

Fourth, to establish a biosafety system, all vehicles transporting feed appliances will take the clean road, and vehicles transporting chicken droppings, hairy chickens, and diseased chickens will take the dirty road, so as to avoid close contact between poultry and wild birds as far as possible in the production of poultry farms, especially not to contact wild ducks and other birds, which is of great significance to prevent the introduction of highly pathogenic avian influenza virus.

Fifth, do a good job in house disinfection. After the flock is out of the pen or transferred, the empty house disinfection system should be carried out, especially in the chicken farm where bird flu has occurred. First, clean the enclosure, and then rinse the house thoroughly with water. After rinsing clean, aldehydes, chlorine-containing disinfectants, phenols, oxidants, alkalis, etc. can kill viruses in the environment. During disinfection, the floor, net bed and the door of the chicken house should be sprayed. After disinfection, the empty column time is not less than a week. Each batch of chickens should be put in and out of the house in a full way, and must not be mixed. During the feeding period, the enclosure should be disinfected with chickens, the hatchery should be disinfected once a week, the fattening house and breeder house should be disinfected once a week, and the disinfectant with high efficiency and low toxicity should be used.

Second, do a good job in immunization to improve the effective immune density of poultry flocks.

Targeted vaccination within a specific period of time is a key measure to prevent outbreaks and epidemics of avian influenza. Due to the large number of serotypes of avian influenza and poor cross-protection, when vaccinated, poultry farms must select the corresponding subtype vaccine according to the local epidemic subtypes in order to achieve good immune effect. At present, inactivated vaccines are generally used for immunization, and avian influenza vaccines against H5 and H9 subtypes are mainly used in our country. Before injection, we should first look at the validity period of the vaccine, whether it is within the range of validity; secondly, we should check the quality of the vaccine to see if there is any deterioration or precipitation. For the immunization of poultry flocks, the appropriate vaccine and immunization time must be selected according to the epidemic occurrence and epidemic situation of the local area and the poultry farm. At the same time, antibody monitoring should be strengthened to determine the interval between secondary immunization of various vaccines or to decide whether or not to supplement immunization.