An overview of production systems designed to prepare naïve replacement gilts for impending PRRSV challenge: A global perspective

This paper reviews production systems for preparing gilts that are negative for porcine reproductive and respiratory syndrome virus (PRRSV) to be introduced into infected herds. We discuss four strategies, including: 1) two-stage development—isolation and acclimation centers, 2) IsoweanTM introduction, 3) the transition center concept, and 4) the parity-one production herd. This paper does not attempt to rate the programs, nor provide results from scientific studies; rather, its primary purpose is to review a sampling of gilt development programs encountered throughout the world. Veterinarians are encouraged to assess the existing replacement stock strategies within their clients’ herds, and to implement concepts derived from this paper to control PRRSV-related reproductive disease. Sample calculations for determining inventory and pig flow, as well as suggestions concerning the use of PRRSV vaccine, are provided.