An Exploratory Pilot Study to Investigate the Potential Relationship Between Porcine Reproductive and Respiratory Syndrome (PRRS) Virus Viremia Changes and Barn Manure Pit Management Procedures.

Porcine reproductive and respiratory syndrome virus (PRRSV)-positive pigs can be exposed to high concentration of gases, such as ammonia and hydrogen sulfide when manure and urine stored in the pits beneath them is agitated and pumped. Such acute exposure can lead to adverse health effects such as respiratory system irritation. This study aimed to explore whether PRRS-positive growing pigs experience changes in viremia detection after manure pit agitation and pumping has been performed. To address this objective, two PRRS-positive growing pig farms were conveniently selected and visited twice during the week before and after manure agitation and pumping. Blood samples were collected to assess detection of viremia, using reverse transcription-polymerase chain reaction (RT-PCR). A logistic regression model was used to evaluate serum detection of PRRSV before and after the manure management event, accounting for pig age. Although PRRSV was detected in the serum of some pigs, under the conditions of the study, there were no statistically significant changes that would indicate that viremia detections change after the pigs had been exposed to barn manure pit agitation and pumping.