1. Cause analysis

1.1 All pig farms did not establish laboratories themselves, nor did they carry out regular spot tests and antibody tests. The vaccines were injected only with recommended immunization procedures. The actual antibody level of sows was unclear. Sows with low antibody levels are infected during pregnancy and infect fetuses or piglets. For example, in the pig farm of 90 sows in a field in Xinji City, Hebei Province, 12 sows had stillbirths and weak litters, and 26 sows had no estrus or repeated infertility. As determined by the indirect hemagglutination test of swine fever antibodies, serum antibodies in 74 pregnant sows were in the ratio of 1:64 and the lowest protection value was 51. The passing rate was only 68.9%.

1.2 The quality of the vaccine and its use, the quality of the swine fever vaccine purchased at the official bio-pharmaceutical monopoly is guaranteed, but the farms are all in the countryside. For ease of use, there are refrigerators to keep the vaccine and it is easy to return to the market. Failure to protect or save electricity during the storage period caused the vaccine to decline in quality. When the vaccine was inoculated, the injection dose was inaccurate, the needle was used improperly, or the injection depth was inappropriate. This caused the injection dose to be insufficient. Some vaccines were diluted more and they did not pay attention to darkness. They were not used up in the morning and continued to be used in the afternoon to reduce the quality of the vaccine and result in poor immune response.

1.3 Feed moldy causes pig immunity to decline. Moldy feed is mainly wheat bran and corn. Wheat bran is due to high water content and long storage time. Due to climatic reasons, corn has been contaminated by mold in the field and it has become moldy when purchased. The pigs have eaten moldy feed for a long time, which damages the function of the stomach, intestines, liver and kidneys of the pigs and reduces the immunity of the pigs. Although pigs were vaccinated as required, the pigs were still in poor condition and pigskins still occurred.

1.4 Most pig farms are home-style pig farms. They are both owners and administrators, as well as buyers and technicians for disease prevention and treatment. At the same time, they also have to undertake many tasks such as contracting land, fruit trees and other agricultural activities, family life, and social contacts. They cannot focus on the management and breeding of farms. They are often constrained by funds, and regardless of feed quality, they will be used as long as they are sold. Therefore, the viscera of pig farms are uneven and the health level of pigs is uneven. Pig farms are susceptible to various diseases, resulting in mixed infections of swine fever and other diseases.

1.5 The occurrence of swine fever in piglets bought from the market was mainly due to the fact that some piglets had been infected with swine fever at the time of transport or at the bazaar; some piglets were vaccinated with swine fever vaccine within 7 days before sale, immediately after purchase. Inoculation of swine fever vaccine resulted in serological inhibition. Some piglets developed infection due to stress caused by stress factors such as lifting, transportation, and climate.

2. Control measures

2.1 Improve diagnostic techniques. There has been a great change in the prevalence and pathogenesis of swine fever, which requires us to be more careful in diagnosis, grasp its unique characteristics and carry out a new diagnosis, and then make use of laboratory diagnosis to ensure accurate diagnosis and symptomatic prevention and treatment. .

2.2 Develop an immunological monitoring system, scientific health and epidemic prevention procedures and systems, and earnestly implement anti-pandemic and sow monitoring. Antibody titer monitoring will eliminate pigs with low serum antibody levels within a certain period of time after immunization. In the case of farms, husbands, sows, and reserve pigs, a swine fever antibody test was performed every 6 months. Hog larva antigen positive (poisoned) pigs were detected and immediately eliminated. Doing it three times in a row can completely clean the farm. After the introduction of breeding pigs to the field, they must be quarantined and treated according to the condition of serum antibodies. To purchase each batch of vaccine at the special sale of biological products, vaccine titer testing should be conducted to ensure the quality of the vaccine.

2.3 The implementation of piglet advanced immunity, 60 days of age two exemptions, practice has proved that the effect is better. If the pig farm is better cleaned, it can be first exempted at 25 days of piglets and exempted at 65 days of age.

2.4 It is best to practice self-breeding and self-cultivation. Do not buy piglets from outside. If you need to buy piglets, you must buy them from regular farms.

2.5 It is best not to keep the vaccine in the pig farm. It is purchased with the use of an ice bottle. Strict implementation of the vaccination operating procedures, the best use of swine fever vaccine a single vaccine, as far as possible without joint vaccine. The diluent should be equivalent to the temperature of the vaccine. That is, put the diluent in the refrigerator and store it at a temperature of 49°C. The diluted vaccine should be protected from light. It should be used within one hour. The remaining vaccine and empty bottle are put into the fire. destroy. For the sake of safety, you can use the "Ebon" swine inactivated vaccine.

2.6 Pig farms should focus on scientific feeding and management, strengthen nutrition, add anti-mildew and mildew-removing agents to feeds, do a good job in environmental sanitation, formulate and implement scientific management measures, and improve the health level of pigs so as to produce a strong pig. Immunity.

2.7 All-in-all-out is an important technical measure for large-scale pig farms, which is conducive to the health of pigs and the purification and management of pig farm diseases.

2.8 Polyporus umbellatus serum is an effective preparation for the treatment of swine fever, to prevent secondary infection, can be combined with other anti-bacterial anti-inflammatory, antiviral drugs.

2.9 Develop the scale of pig raising, and gradually change small-scale large groups and family-style pigs for joint-stock cooperative-scale breeding, taking the road of specialization, standardization, and standardization of production. Basically eliminate the occurrence of swine fever.

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