Subsequent era biosecurity gives sustainable prevention of PRRS
5 September 2025
3 minute learn
[Edited presentation by Scott Dee, R. Edler, Pipestone Research; L. Brands, A. Schelkopf, J. Nerem, G. Spronk, Pipestone Veterinary Services; M. Kikuti, C. Corzo, University of Minnesota, USA, during the 2024 North American PRRS Symposium]
Porcine reproductive and respiratory syndrome virus (PRRSV) is a globally important pathogen of pigs. Controlling the entry of PRRSV to swine breeding herds is vital to maximizing animal well being, welfare, and productiveness. The target of this examine was to judge the impression of improved biosecurity on the PRRSV incidence danger and to know whether or not these practices influenced breeding herd productiveness.
A retrospective cohort examine evaluating PRRSV incidence danger was performed over a 3-year interval, from July 1, 2021, to June 30, 2024, throughout breeding herds from a industrial swine manufacturing system (Pipestone, MN). Over the course of the mission, 69 herds/321,013 sows participated in 12 months 1, 76 herds/381,404 sows in 12 months 2, and 75 herds/384,207 sows in 12 months 3.
Throughout the database, two cohorts of herds which differed of their degree of biosecurity practiced have been categorised as Subsequent Era Biosecurity (NGB) COMPLETE or NGB INCOMPLETE. Subsequent Era Biosecurity makes use of science-based measures for the prevention of the PRRS virus and improves productiveness in swine breeding herds. The protocols consider mechanical, aerosol and feed danger on the sow farm degree, as a substitute of solely specializing in mechanical danger.
PRRSV incidence danger was calculated utilizing MSHMP pointers for every illness 12 months, and over the 3-year interval. The distinction within the proportion of PRRSV optimistic herds (# new PRRSV infections/# breeding herds) throughout the 3-year interval was analyzed for significance by Chi sq., the cumulative PRRSV incidence danger throughout all herds in the course of the 3-year interval was calculated, and the affiliation between the extent of biosecurity (COMPLETE vs INCOMPLETE) and illness burden (PRRSV incidence danger) was examined by Chi sq..
As well as, variations in key efficiency indicators (KPIs) between 43 NGB COMPLETE HERDS and 19 NGB INCOMPLETE herds over illness years 1 and a couple of have been analyzed for significance by T check. For evaluation of KPIs, solely herds that offered two full years of knowledge throughout illness 12 months 1-2 and have been managed by genetics, diet, farm administration, worker coaching applications, animal dealing with protocols, report preserving, and animal well being have been chosen. Lastly, neighboring swine density inside an 8.3 km radius of every breeding herd was calculated over the three years.
The proportion of optimistic herds was 6/69 (8.7%) in 12 months 1, 7/76 (9.2%) in 12 months 2, and 11/75 (14.6%) in 12 months 3 (p = 0.77). The cumulative incidence danger was 8.0%, and considerably decrease (p < 0.0001) PRRSV incidence danger was related to NGB COMPLETE vs NGB INCOMPLETE herds.
Concerning variations in KPIs, NGB COMPLETE herds had larger complete born piglets/farrowing (p = 0.047), and pigs weaned/feminine (p = 0.021), decrease preweaning mortality (p = 0.013) and shorter weaning to first service interval (p = 0.007) than NGB INCOMPLETE herds. As well as, whereas not statistically important (p = 0.15), NGB COMPLETE herds additionally had a rise of 0.91 pigs weaned/mated feminine/12 months. Lastly, no variations have been noticed within the space density surrounding NGB COMPLETE and NGB INCOMPLETE herds throughout the three years of the examine.
This retrospective cohort examine gives proof that NGB, whereas not good, offered sustainable management and prevention of PRRSV and improved breeding herd productiveness. That is the primary report of profitable PRRS management in a big industrial manufacturing system for this prolonged time frame.
