Affected by African Swine Fever, domestic pig stocks have declined, and the organization and operating procedures of pig farms have changed compared with the past. From basic daily work to disinfection, health care, immunization, and feed and nutrition ratios, there have been corresponding changes, but The increasingly serious stress response of the pig herd makes the pig farm encounter new challenges on the road to prevent non-reproduction. In the face of the long-term pig price bonus in the future, reducing the stress of the pig herd to effectively prevent and control African swine fever and ensure stable success has become a topic of greater concern to pig farmers.

The meaning of stress

Stress refers to a series of neuroendocrine responses characterized by sympathetic overexcitement and abnormally enhanced adrenal cortex function when an organism (in particular pigs) is stimulated by various factors.

The harm of stress

1. The body's immune function is decreased, and the immune response is poor (immune suppression).

2. Vomiting, trembling, depression and fever (providing the necessary temperature for the cells infected by the African swine fever virus).

3. Cause loss of mucosal barrier, showing gastrointestinal dysfunction, diarrhea, edema, bleeding and ulcers in the gastrointestinal tract (virus invasion is more convenient).

4. Pigs are susceptible to disease (viruses are more susceptible to attack).

5. Productivity decreases and feed utilization rate decreases.

The influence of pig herd stress on African swine fever

Looking at the characteristics of early African swine fever infection:

1. African swine fever virus enters the tonsils mainly through the mucous membranes of the nose and mouth, and quickly spreads throughout the body through the lymph nodes and blood.

2. The aggregation of granulocytes in blood cells can accelerate the spread of African swine fever virus.

3. The African swine fever virus requires a specific pH and temperature (higher body temperature) to infect cells.

4. The main means for the African swine fever virus to achieve immune evasion is to inhibit the secretion of interferon.

It can be seen that pig herd stress provides sufficient opportunities and convenience for the early invasion and replication of African swine fever virus through mucosal immune damage, fever, abnormal secretion of body cytokines, and immunosuppression, which greatly increases the prevention of disease in pig farms. The risk of resuming production. Therefore, the pig farm must reduce the stress of the pig herd during the process of preventing non-resumption of production. Therefore, it is recommended that you choose water-based adjuvants and scientifically verified joint vaccines during vaccination to achieve stable and safe production.