Porcine reproductive and respiratory syndrome is a pig of new viral diseases, clinical symptoms of the disease to reproductive failure of sows and pigs of different ages breathing difficulties as the main feature, so called "pig reproductive and respiratory Disorder syndrome"; sometimes the pig's ear will turn blue and blue, so it is also known as "blue ear disease."
After the disease is infected, it is easy to be followed by other bacterial and viral diseases, which make the clinical symptoms different and various forms.
Sow: body temperature rises to 40 ° C -41 ° C, lack of energy, not eating, snoozing, dry stool, difficulty breathing, some sick pigs in the ears, the inside of the limbs, abdominal skin purple, individual pigs at the end of the ear congestion, presented Black and purple, even the ears are dry and fall off. Pregnant sows have miscarriage, premature birth, stillbirth or mummified fetus. Most of the abortions occur in the late stages of pregnancy, and preterm births occur mostly in the first 10 days of prenatal period. In the expected date of birth, there are more stillbirths and weaker fetuses.
Piglets: pale skin, rough hair, diarrhea, elevated body temperature, some unstable walking, muscle tremors, hind limb paralysis, slow growth, and extremely high mortality. The head of the newborn pig, the conjunctival edema of the eye. Some piglets have a healthy appearance at birth, but they develop soon after birth, showing elevated body temperature, difficulty breathing, white skin, low or no food, diarrhea and other symptoms, and the mortality rate is also high.
Diagnosis: Because the disease is likely to cause secondary or mixed infections of other diseases, the symptoms and lesions observed in the clinic may not be completely caused by the disease (such as chronic swine fever, pig parvovirus disease, Brucellosis in pigs, Japanese encephalitis in pigs can cause reproductive problems in pigs. If a pregnant sow has a miscarriage, stillbirth, premature birth, or mummified pig, the piglet has difficulty breathing, squatting, and mutual aid. Symptoms such as disorders can be suspected, but the most accurate way to diagnose this disease is to do laboratory tests.
Comprehensive prevention and treatment: The disease is a new type of viral infectious disease. So far, there are no practical methods for prevention and treatment and special effects drugs.
(1) Adhere to self-propagation: Placenta transmission is an important transmission route of this disease, so it is an important preventive measure to adhere to self-propagation and self-support, and not to introduce from infected areas and pig farms with a history of this disease.
(2) Strict quarantine system: When it is necessary to introduce, the quarantine system must be strictly implemented, and blood samples should be sent to qualified laboratories for antibody detection of blue ear disease. Antibody-positive pigs should never be introduced. Antibody-negative pigs should also be isolated. Until the sow has no reproductive disorders after pregnancy, the piglets produced can be mixed with other pigs without the symptoms of blue ear disease.
(3) Vaccination: Currently, there are two vaccines, inactivated vaccine and attenuated vaccine, which can be used. In China, we have also developed inactivated vaccines suitable for the epidemic strains in China. It is reported that the antibody reaches a peak 20 days after immunization and can last for about 6 months. It can be used for immunization prevention of breeding pigs, and can also be greatly applied to the infected farms. Increase the sow rate of the sow and the survival rate of the piglets. Care must be taken for the application of attenuated vaccines. If the farm has been infected with the disease by serological tests, consider using attenuated vaccine to alleviate the respiratory symptoms of the piglets, reduce mortality, increase the fertility of the sows, and reduce economic losses. . The immunization program of attenuated vaccines is: vaccination of gilts 2 to 3 weeks before breeding, ensuring high titer antibody levels to effectively protect against virulence during pregnancy; piglets can be performed before 18-21 days of maternal antibody disappearance It can also be carried out by pre-weaning and post-weaning secondary immunization methods that are popular abroad.
Vaccination does not produce 100% protection, but only a certain preventive effect. After using the vaccine, there is still the possibility of onset, especially the use of attenuated vaccines should be more cautious.
(4) Measures at the time of onset: Once the disease occurs on the farm, the sick pigs and the pigs with healthy appearance should be kept in isolation as soon as possible. The waste and the sink are strictly separated, and the pigs cannot contact each other to prevent infection.
Symptomatic treatment for sick pigs: penicillin 20,000 IU / kg, chlorpyrifos 0 · 1 kg, 2 times / day, 7 days for a course of treatment to relieve symptoms and prevent secondary infection.
Pregnant sows can try traditional Chinese medicine to clear away heat and detoxify, prevent miscarriage: Angelica, rehmannia, fried white peony, Miao Ai, clam shell, motherwort, honeysuckle, magnolia, moxibustion licorice, decoction prevention, once every other week, once every two times.
Preparation of self-cultivation seedlings: Using the spleen, kidney, lung and other tissues of the dead piglets in this field to make 10% (volume ratio) self-organized inactivated vaccine, the effect is very good.
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