The Danish nationwide PRRS (Porcine Reproductive and Respiratory Syndrome) discount technique, launched in Could 2022, goals to attain 75% of slaughter pigs from herds with detrimental PRRS well being standing and 85% of sow herds with detrimental PRRS well being standing by the tip of 2025. By January 2025, 68% of all Danish pig herds had a detrimental PRRS well being standing, 24% had a constructive PRRS well being standing, and 6% have been beneath eradication. The remaining 2% had an unknown standing relating to PRRS.
Based mostly on knowledge from the CHR (Central Herd Register) and SPF database. Contains declaration of each PRRS1 and PRRS2
There’s a massive variation within the regional distribution of herds with a constructive well being standing with the next prevalence within the western a part of Denmark. PRRS virus can unfold regionally and thru the air, making area-based herd eradication an important element of the discount technique. Eradication areas have been established primarily based on the geographical location of Danish pig herds, and these areas are constantly adjusted to take native situations into consideration. Native PRRS directors have been appointed and are coordinating the efforts in every area.
As of January 2025, 4,334 herds representing all skilled farms in Denmark have been coated by the PRRS discount technique, as that they had no less than 10 sows and/or no less than 100 pigs in complete within the herd. Amongst these, 89% have been in an eradication area. It is a important enhance in comparison with January 2024, when 54% of all pig herds have been in an eradication area. Along with the initiation of latest areas the boundaries of the prevailing areas have been redefined throughout 2024.
The event of PRRS standing in Danish pig herds since January 2022 exhibits a steady enhance within the proportion of herds with detrimental PRRS well being standing, from 32% on the finish of 2021 to 68% on the finish of 2024. All through the entire program all boar stations delivering semen doses have remained detrimental to PRRS. Nucleus and multiplier herds are continuously examined for PRRS.In case of constructive samples the herd are put beneath restrictions and are being eradicated for PRRS as quickly as potential.
The general an infection danger for sow herds decreased in comparison with earlier assessments and was 2.9% per 12 months in 2024, which is greater than a halving in comparison with earlier than the PRRS technique was carried out.
The an infection danger for sow herds has greater than halved because the begin of the discount technique.
PRRS eradications
Two fashions of PRRS eradication applications are getting used at herd degree in Denmark:
- Complete depop-repop: by definition, complete depop-repop eradication of PRRS is all the time profitable.
- Partial eradication with the LCH technique (Load, Shut, Homogenise) which accounted for 88% of all herd eradication carried out in Denmark throughout 2024 with a succsses charge of 86% of all makes an attempt.
In 2024 the ratio between sow herds finishing PRRS eradication and sow herds being contaminated with PRRS was roughly 3-1 which was equal to the earlier years
The Danish PRRS discount technique is starting to indicate promising outcomes, with an rising variety of sow and finisher herds having detrimental PRRS well being standing. New initiatives with declaration of PRRS freedom by county, elevated serological surveillance and restriction on actions of pigs with a constructive PRRS well being standing is predicted quickly to be issued. These new guidelines together with the opposite fundamental parts of the technique together with necessary declaration of the serological PRRS standing of all pig herds and a reduced worth of PRRS virus-positive pigs at supply for slaughter will enhance the motivation for the eradication of PRRS from the remaining Danish pig herds.
Classes discovered
The primary three years of the Danish PRRS discount technique have proven that it’s potential to manage and scale back the prevalence of PRRS in Danish pig manufacturing. Good group with native anchoring is essential for fulfillment. Our eradication fashions have confirmed efficient, with PRRS-free pigs demonstrating higher productiveness and decrease antibiotic consumption. All the nation is now organized into PRRS discount areas, and outcomes from the primary three years point out that it’s possible. Space-based eradication can succeed, however it requires cautious consideration relating to pig commerce and robust native assist. Everybody have to be concerned to attain success.
The Danish PRRS discount plans are paving the highway for a future nationwide eradication of PRRS from the Danish pig manufacturing.
