Evaluation of a stillborn (pre-colostral) piglet sampling and testing procedure for possible inclusion with a conventional soon-to-wean piglet monitoring procedure to measure time-to-virus-negative-pi

摘要

Elimination of porcine reproductive and respiratory syndrome virus (PRRSV) from breeding herds using methods like whole-herd immunization, herd closure and rollover has been shown to be effective. Judging with sufficient confidence the point at whicha PRRSV-positive breeding herd begins to consistently produce entire groups of PRRSV-negative weaned pigs is valuable for two reasons. First, PRRSV-negative weaned pigs can begin to co-mingle with other sources or groups of PRRSV-negative weaned pigs with minimized risk of post-weaning pig to pig field virus transmission. Second, PRRSV-negative weaned pigs can signal when it is appropriate to reopen a closed breeding herd, and then resume replacement gilt flow with naive replacements where the goal is to eliminate virus from a breeding herd or flowing in immunized and field-virus negative replacements where the goals is to maintain the breeding herd in a positive, stable state.