How long does it take for a breeding herd to produce PRRSv-negative piglets?

Linhares, DanielTorremorell, MontserratMorrison, Robert2012-11-192012-11-192012-09-15https://hdl.handle.net/11299/139371en-USswinepigherd healthHow long does it take for a breeding herd to produce PRRSv-negative piglets?Conference Paper