Studies On Monitoring Blood Serum Antibody Of Poreine ReProductive And ResPiratory Syndrome In The Scale Pig Farm

Porcine reproductive and respiratory syndrome viruses(PRRSV) can cause to porcine reproductive and respiratory syndrome(PRRS), other called disease of blue ears. It induces reproductive disorder of sows and impact respiratory system of piglets, which have long history with the infection in my country. It is to spead quickly, involve widely, and hardly break away the pig cultivation from the healthy development road. PRRS was breaked overall out for the first time in our coutry,but now "high fever sick "is spreading to entrie county, contract to PRRS more harmful.This study use ELISA serological method to monitor the PRRSV antibody of the boars(sows, replacement gilt, boars) and the commercial pigs of different age in the pig farm from 2005.04 to 2009.11 every half a year.The result shows that the PRRSV antibody level of the boars and the commercial pigs growth and decline actuality concerns with the clinical disease and symptom of pigs, and that it understands the PRRSV antibody of swinery fluctutate impact the antibody level and growth and decline regular pattern.In 2007.6, the farm break out PRRS, artificial infection was carry out to make the swinery infect PRRSV intensively and shorten the dease time cause by PRRSV.The result show that the swinery can gain a high level antibodies against PRRSV and the coefficient of variation about the swinery was very low.The performance of the swinery was stable and superiority. Although PRRSV was still in the farm which can be see from infection of the piglets lost the maternal antibody of PRRSV, the harm to the piglet was not severity. The effectiveness of artificial infection was last nearly two years. Two years later, the farm break out PRRSV again, the situation came back to the time before artificial infection.These indicated the importance of the high level antibodies of PRRSV and the regularity of antibodies to resist the PRRS.Controlling growth and decline regular pattern of piglets and recognizing PRRSV infection link, it can be more effective to direct to remove virus. This experiment also express that fluctuation of PRRSV antibody level was caused by replacement gilts, threating swinety. It should comprehend the risk to assume the responsibility, and enact the protection of introduction. Through analysising the antibody level of entire pigs, prevention and control plan was instituted.