Blue-ear disease prevention and control of blue-ear disease is characterized by reproductive problems in pregnant sows (abortion, stillbirths, mummy) and respiratory diseases in pigs of all ages, especially piglets, and has now become the major epidemic in large-scale pig farms. First, the blue ear disease has been called "mysterious pig disease", "new swine disease", "pig epidemic abortion and respiratory syndrome", "porcine reproductive and respiratory syndrome", "blue ear disease", "pig plague" And so on, China has classified it as a second-class infectious disease. The porcine reproductive and respiratory syndrome virus is a single-stranded positive-stranded RNA virus belonging to the genus of nested viruses, arteriviruses, and arteriviruses. Does not agglutinate mammalian or avian red blood cells, has strict host specificity, and is monophilic to macrophages. The proliferation of the virus has an antibody-dependent enhancement effect, and in the presence of neutralizing antibody levels, the ability to replicate on the cell is instead enhanced.
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Black Garlic Production Process
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Porcine blue ear disease is a highly contagious disease that is epidemic. Only pigs were infected, and pigs of all breeds, ages, and uses were infected. However, pregnant sows and piglets less than one month old were the most susceptible. Affected pigs and infected pigs are an important source of infection. The main route of transmission is contact infection, airborne transmission and semen transmission, and it can also be transmitted vertically through the placenta. Susceptible pigs can be infected by oral, nasal, intramuscular, intraperitoneal, intravenous, and intrauterine vaccination. After 2 to 14 weeks after the virus is infected in pigs, the virus can be transmitted to other susceptible pigs through contact. Viruses can be detected in the nasal cavity, feces and urine of infected pigs. Susceptible pigs may be infected by direct contact with infected pigs or by contact with transport vehicles or devices that are contaminated with the blue ear virus. The flow of infected pigs is also an important means of transmission of the disease. Persistent infection is an important feature of the epidemiology of PRRS, and PRRSV can persist for a long time in infected pigs. The blue ear virus can pass through the placenta through the blood circulation to infect the fetus and cause reproductive problems such as miscarriage of sows in late pregnancy. The incubation period of this disease is quite different, and the latency period for PRRS infection in susceptible herds after infection is introduced. The shortest period is 3 days and the longest is 37 days. The clinical symptoms of the disease vary greatly and are affected by the virus strain, immune status, and feeding and management factors and environmental conditions. Low-violence strains can cause prevalence of no clinical symptoms in pigs, while virulent strains can cause serious clinical illnesses.
How can we effectively prevent blue-ear disease?
1, to improve environmental hygiene, so that the virus does not have the space to survive. One of the most effective measures is to adopt a fermentation bed to raise pigs. Through the author's follow-up survey of the users of the Jinbao fermentation bed, it can be shown that the fermentation bed does have unique advantages in preventing epidemics. Since beneficial functional microorganisms in the fermentation bed are dominant both in quantity and function, there is no soil for survival of the diseased bacteria. It can prevent the spread of blue ear disease to the maximum extent.
2. Adhere to the principle of self-cultivation and self-sustainability and establish a stable breeding herd, which is not easily introduced. If it is necessary to introduce, we must first find out the epidemic of the pig farm that was introduced. In addition, serological tests should be carried out. Negative pigs should be introduced, and the introduction of positive pigs should be strictly prohibited. After introduction, appropriate isolation zones must be established and monitoring work must be done. Generally, it takes 4 to 5 weeks for isolation and quarantine. Healthy people can only feed in groups.
3, do a good job feeding pigs and management. In pig farms infected with porcine reproductive and respiratory syndrome virus, feeding and management of the pigs at each stage should be well done to ensure the nutritional level of the pigs, so as to increase the resistance of the pigs to other pathogenic microorganisms and thus reduce secondary diseases. The incidence of infection and the resulting loss.
4. Do a good job of immunization against other diseases and control other diseases, especially the control of swine fever, pseudorabies and swine asthma. In pig farms infected with porcine reproductive respiratory syndrome virus, best efforts should be made to control swine fever, otherwise it will result in high mortality rate of pigs. At the same time, immunization against swine asthma vaccine should be implemented to reduce the risk of M. hyopneumoniae infection. Invade the lungs, thereby increasing the resistance of the pig's lungs to respiratory pathogen infections.
5. Regularly monitor the status of the infection of porcine reproductive and respiratory syndrome virus in pigs to understand the disease's activity on the farm. In general, once a quarterly monitoring, the pigs in each stage are sampled for antibody monitoring. If there is no significant change in the positive rate of the four monitoring antibodies, it indicates that the disease is stable on the farm, on the contrary, if it is in a certain quarter. The increase in the positive rate of antibodies indicates that there are problems in the management and disinfection of farms. Should be corrected.
6. Strictly seal the locks on the affected farms; take certain measures on the pig farms around the affected pig farms to avoid the spread of diseases; do no harm to the aborted tires, stillbirths and dead pigs, and thoroughly disinfect the maternity ward; isolate Diseased pigs, symptomatic treatment, improved feeding conditions, etc.
7. Regarding vaccination, there is currently no effective immune control measures. Currently, commercial PRRS attenuated vaccines and inactivated vaccines have been introduced at home and abroad, and domestically approved inactivated vaccines are also available. However, the phenomenon of increased virulence of PRRS attenuated vaccines and safety issues have caused increasing concern. There are many outbreaks of PRRS in pigs that use attenuated vaccines at home and abroad. Therefore, live vaccines should be used with caution. Although the immune efficacy of inactivated vaccines is limited or uncertain, there is no problem in terms of safety. Therefore, in infecting pig farms, inactivated vaccines can be considered for sows. Details can visit the website or consult.
