Abstract
For five years, on a PRRS-positive farm with 500 sows, we have conducted tests with the aim of producingpigs testing negative for the PRRS virus (PRRSV) by injecting live PRRS vaccine into the sows 50-60 days afterservicing and 7-14 days after delivery (1 dose/head/time) and into the piglets after weaning (0.5 dose/head/time), after confirming that the percentage that were PRRS positive at 30 days of age had fallen from 100%to 20%. The pigs tested were divided into groups of five barrows weaned at 18 days and individual lots of sevenboars weaned at 22-27 days, and the lots were reared separately at two locations outside the farm immediatelyafter weaning. The group lot was tested four times (at the ages of 18, 46, 113 and 184 days) and the individuallot was tested three times (at the ages of 22-27, 86-91 and 174-179 days) by means of ELISA and RTPCR, and confirmed that all pigs were PRRSV negative. It is suggested, therefore, that it is possible to produce PRRSV negative pigs in a commercial PRRS positive farm.
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