How to prevent porcine parvovirus disease? A detailed explanation for you
How to prevent porcine parvovirus disease? A detailed explanation for you
Generally speaking, the impact of parvovirus infection on fetuses differs depending on the stage at which the sow is infected. If a sow is infected with parvovirus before mating, the fetal mortality rate is extremely high, basically the whole litter dies. If a sow is infected with parvovirus during gestation, the fetuses may still survive, but these fetuses are certainly carriers of parvovirus and will become new sources of infection. Parvovirus is extremely contagious, and feed and water are both transmission routes.
So far,treatmentthere is no specific drug for porcine parvovirus disease,prevention and controlare based mainly on vaccine immunization, supplemented by preventive management. Parvovirus basically shows no symptoms in pigs other than sows; in sows, the symptoms are mainly obstetric and gynecological diseases, usually infertility, stillbirth, miscarriage and so on. The stillborn fetuses delivered by sows have subcutaneous blood accumulation accompanied by edema, and surviving piglets show dermatitis and diarrhea.
There are currently five types of porcine parvovirus vaccines, namely inactivated vaccine, attenuated vaccine, subunit vaccine, live viral vector vaccine and nucleic acid vaccine. Each of these viruses has its advantages and disadvantages. The ones people come into contact with most often are inactivated vaccine and attenuated vaccine; the other three vaccines are either too expensive or carry too great hidden risks, and are currently difficult to promote.
Inactivated vaccines have a long antibody retention time, do not require low-temperature storage, and are also very safe. But the disadvantages of inactivated vaccines are also obvious: they produce antibodies slowly, cost relatively more, have unstable effects, and require repeated vaccination. Attenuated vaccines not only produce antibodies quickly and have relatively good immune performance, but also cost relatively less; however, their safety is unstable and they carry a certain risk. You can choose the most suitable vaccine for vaccination.
When gilts are bred for the first time, it is best to complete two vaccine immunizations 20 days before mating, with the two vaccinations 20 days apart, because after pigs are vaccinated it generally takes 15 days to produce antibodies, so doing it in advance is more appropriate. If gilts are immunized this way for three consecutive litters, basically no further vaccination is needed afterward. If conditions are limited, you can also do it for two consecutive litters.
Maintaining a good environment can also reduce the probability of a parvovirus outbreak. Usually, you must disinfect regularly, maintain good barn hygiene, and not let manure accumulate. Feed must be safe and not moldy. Water must be clean and free of contamination. When necessary, some Chinese herbal medicine can be added to the feed to regulate the sow's body.