Formulation of Classical Swine Fever Immunization Procedures in Large scale Pig Farms

摘要

[Objective] The paper was to formulate classical swine fever (CSF) immunization procedures in large scale pig farms. [Method] Antibody maintenance time and dynamics of material antibody was detected by enzyme linked immunosorbent assay (ELISA), and scientific primary immunization time of piglets was explored. [Result] The positive rate of sows reached the highest level of 93% at 4 weeks post immunization. Piglets were immunized at 9 weeks of age, the antibody level did not increase at 3 weeks post immunization, but increased rapidly after secondary immunization; the antibody level in late fattening period was high, and pigs could be protected completely. [Conclusion]General prevention of CSF is suitable for scale farming. It takes about 4 weeks to produce CSF antibody. Therefore, pig farms should conduct immunization timely at one month prior to susceptible stage according to their infection pressure.