Respiratory diseases like the porcine reproductive and respiratory syndrome (PRRS), cause important economic losses in the pig production. Besides the genotypic and phenotypic differences of the strains, the symptoms depend also on the age and the immune status of the herd but sustainably so also by the management and environmental factors.
The aim of this study was to see if there is a correlation between the PRRSV status of the farms and the results of the pathological-anatomical lung lesions in slaughter pigs. For this reason, a representative number of pig farms (18 of exclusive fattening farms and 48 combined farms (nursery and fattening unit at the same location)) were chosen for testing within a defined time period for data analysis. The serum for the detection of PRRSV antibodies by ELISA was exclusively taken at the slaughterhouse from non-vaccinated fattening pigs.
The survey of the pathological-anatomical lung lesions of all slaughter pigs was performed by authorized veterinarians at the abattoir. The results of the statistic evaluation were used to calculate possible significant correlations and the prevalence of lung lesions and pleuritis in PRRSV positive and negative farms. In tendency, combined farms were more severely affected than fattening farms.
Both, the PRRSV status of pig farms (PRRSV antibody positive and negative) and the kind of pigs farm (fattening and combined) had an influence on the lung health of the fattening pigs. The immunosuppressive effect of the PRRSV plays an important role as well and can lead to the appearance on non PRRSV-typical findings, which may indicate the involvement of other primary and/or secondary infections.