Table 1 Background information and monthly PRRSV monitoring of breeding pig farms
Farm number | Sow stock (head) (mean ± sd) | Year of farm establishment | Monitoring period | PRRSV vaccine use | Sampling plan |
|---|---|---|---|---|---|
1 | 4,333 ± 710.95 | 2018 | June 2021-December 2023 | Noa | Farm No. 1–11: (1) PRRSV pathogen detection: 30 samples of sow cord blood per month, 30 samples of nasal swab from weaned piglets per month, and 1 sample of boar testicular fluid per month. (2) PRRSV antibody detection: 40 samples of sow serum per month. |
2 | 1,775 ± 445.09 | 2012 | January 2021-November 2023 | No | |
3 | 4,356 ± 646.74 | 2017 | January 2021-December 2023 | No | |
4 | 4,138 ± 961.87 | 2015 | January 2021-December 2023 | Yesb | |
5 | 4,640 ± 1230.95 | 2018 | January 2021-December 2023 | Yes | |
6 | 2,015 ± 500.55 | 2010 | January 2021- December 2023 | Yes | |
7 | 4,409 ± 604.18 | 2017 | January 2021- December 2023 | No | |
8 | 4,772 ± 364.35 | 2016 | January 2021-December 2023 | No | |
9 | 1,900 ± 376.42 | 2012 | January 2021-December 2023 | No | |
10 | 631 ± 138.86 | 2009 | January 2021-December 2023 | No | |
11 | 2,344 ± 4,95.94 | 2021 | January 2021-December 2023 | No | |
12 | 5,630 ± 240.31 | 2022 | August 2023-December 2023 | No | Farm No. 12–23: (1) PRRSV pathogen detection: collect cord blood, oral fluid or lung lavage fluid from 3% of the sow population each month. (2) PRRSV antibody detection: collect serum from 3% of the sow population each month. |
13 | 2,184 ± 84.48 | 2014 | January 2021-December 2023 | No | |
14 | 2,103 ± 130.70 | 1995 | January 2021-December 2023 | No | |
15 | 2,371 ± 118.26 | 2018 | July 2021-December 2023 | No | |
16 | 1,073 ± 127.49 | 2012 | January 2021-December 2023 | No | |
17 | ,2334 ± 78.77 | 2020 | November 2021-December 2023 | Yes | |
18 | 1,024 ± 73.17 | 2004 | January 2021-December 2023 | No | |
19 | 2,421 ± 120.56 | 2011 | January 2021-December 2023 | No | |
20 | 4,785 ± 1,697.60 | 2021 | December 2021-December 2023 | No | |
21 | 5,272 ± 1,195.89 | 2021 | November 2021-December 2023 | No | |
22 | 5,510 ± 272.29 | 2019 | January 2021-December 2023 | No | |
23 | 1,087 ± 217.97 | 2012 | January 2021-December 2023 | No |