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Bulletin No. 19 - Fall 2004
VirologyPorcine Reproductive and Respiratory Syndrome (PRRS)
DEWEY CE, WILSON S, BUCK P, LEYENAAR JK
Effects of porcine reproductive and respiratory syndrome (PRRS) vaccination in breeding-age animals
Preventive Veterinary Medicine, 62, 2004, 299-307
The reproductive performance of 52 pig herds from Canada (Ontario and Manitoba) and the USA (Midwest) vaccinated with PRRS modified live vaccine (RespPRRS, Boehringer Ingelheim Ltd) were investigated. None of these herds had 100% of their sow population vaccinated against PRRSV. Herds with more than 50% of vaccinated sows were classified as "majority-vaccinated" herds while the others were classified as "low-vaccinated" herds. The vaccination of sows during gestation is to be avoided since a negative impact was observed in both "low-vaccinated" and "majority-vaccinated" herds with a lower number of pigs born alive and weaned in sows vaccinated during gestation when compared to sows that farrowed prior to the use of the vaccine.
