Cross-sectional study on risk factors for Porcine Reproductive and Respiratory Syndrome virus sow herd instability in German breeding herds.
BACKGROUND
Porcine Reproductive and Respiratory Syndrome virus (PRRSV) stability, besides meeting production targets, is also a requirement for several control options of PRRS in pig breeding farms. This study aimed to investigate the frequency of, and risk factors associated with, PRRSV instability in pig breeding farms in northern Germany. In 120 sow herds, a questionnaire on production and management parameters was filled, and blood samples from 30 suckling pigs from 10 different litters were taken and examined using real-time polymerase chain reaction (PCR).


RESULTS
PRRSV was detected in 32 herds (27%), thus classified as PRRSV-unstable. According to multivariable logistic regression analysis, a suckling period ≤ 21 days, a low distance between the cadaver collection site and the actual sow barn, ≥ 2 pig herds in a 1000 m radius, presence of external employees, a time interval between purchase of gilts of ≤ 9 weeks and a 1- or 2-weekly farrowing rhythm were associated with a higher risk of PRRSV instability.


CONCLUSIONS
External and internal biosecurity as well as management factors were associated with PRRSV instability, which could be targeted by farmers and veterinarians to help them to achieve PRRSV PCR-negative status and in the control of PRRS.
['Nathues|Christina|C|', 'Janssen|Eltje|E|', 'Duengelhoef|Andrea|A|', 'Nathues|Heiko|H|', 'Grosse Beilage|Elisabeth|E|http://orcid.org/0000-0002-4391-0333']
D000818:Animals D001947:Breeding D003430:Cross-Sectional Studies D005260:Female D005858:Germany D019318:Porcine Reproductive and Respiratory Syndrome D019316:Porcine respiratory and reproductive syndrome virus D012307:Risk Factors D013552:Swine
Risk factors Herd management Herd prevalence PRRS control