Effect of PRRSV stability on productive parameters in breeding herds of a swine large integrated group in Spain

Date
2021-02-26
Authors
Linhares, Daniel
Torrents, D.
Miranda, J.
Gauger, Phillip
Ramirez, Alejandro
Ramirez, Alejandro
Linhares, Daniel
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Veterinary Diagnostic and Production Animal Medicine
Abstract

Background In breeding herds, porcine reproductive and respiratory syndrome (PRRS) clinically manifests as increased abortions, number of stillbirths, and pre-weaning mortality, and as a direct consequence, results in a decrease of the number of piglets weaned per sow per year. Breeding farm classification according the PRRS virus (PRRSV) status (unstable or stable) is a key control strategy for this disease. The aim of this study was to evaluate the production improvement related to achieving a PRRSV stable status in breeding herds in Spain. For this purpose, epidemiological and productivity data were collected from a systematic PRRSV monitoring program in 35 breeding herds from a large integrated swine group in Spain. A comparative statistical analysis was conducted using four key production indicators (KPI) between different PRRSV status and a generalized linear mixed model: weekly abortions/1000 sows (ABTHS), born-alive rate (BAR), pre-weaning mortality rate (PWMR), and number of weaned piglets per 1000 sows (WPTHS).

Results From the 35 monitored farms during a total period of 58 weeks, we collected 49 to 58 weeks of production data and PRRSV classification status for each study farm. This represented a total of 1997 (741 unstable and 1256 stable) weekly data collected that was eligible for the KPI comparative study. PRRSV stability was associated with significant improvement in BAR (+ 1.10 %, p < 0.001), PWMR (-0.88 %, p < 0.002) and WPTHS (+ 24.52, p < 0.0001).

Conclusions These results demonstrate for the first time the improved production due to achieving PRRSV stability in breeding herds under field conditions in a European country. Increased number of born-alive piglets and a reduction of piglet pre-weaning mortality represents an increase of 1.28 weaned piglets per sow per year if PRRSV stability was achieved and maintained for one-year period in a breeding farm.

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This article is published as Torrents, D., J. Miranda, P. C. Gauger, A. Ramirez, and D. C. L. Linhares. "Effect of PRRSV stability on productive parameters in breeding herds of a swine large integrated group in Spain." Porcine Health Management 7 (2021): 21. DOI: 10.1186/s40813-021-00203-4. Posted with permission.

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