Producing PRRS negative pigs from PRRS positive sows

摘要

Isowean (Harris, 1990a,b,c; Connor, 1990) and multiple site Isowean production (Harris, 1988a,b) are modifications of the Medicated Early Weaning [MEW] (Alexander et. al. 1980 ) procedure that are useful for producing weaned pigs free of infectious agents. Alarge variety of infectious agents have been eliminated from pigs entering the nursery and finishing stages of production by these methods (Harris and Alexander, 1999). Diseases that can be transmitted in utero complicate these methods for disease elimination. However, both MEW and Isowean have been utilized to produce PRRS negative weaned pigs (Donadeau 1998; Christianson et. al. 1994).