Attempts to eradicate some respiratory and enteric pathogens in Danish pig farms.

摘要

For eradication of several important pathogens in Danish farms, two different procedures are primarily used at the herd level: firstly, total depopulation and repopulation with breeding animals from the SPF system and secondly, partial depopulation combined with strategic medication. Concurrently, with the establishment of more and more farms with two-three site production, partial depopulation with strategic medication has become more popular. The procedure for elimination of Mycoplasma hyopneumoniae. Actinobacillus pleuropneumoniae, Brachyspira hyodysenteriae and Lawsonia intracellularis is described below. Elimination of Sarcoptes scabiei var. suis will be mentioned. At farm level, before making the decision to go for the eradication procedure, several issues should be addressed, such as biosecurity, management and production changes, housing, and financial aspects etc. During the planning phase, laboratory, confirmation of diagnosis of pathogen/s should be carried out. After the elimination procedure has been carried out, the herd should be monitored for clinical signs and specific pathogens by using suitable laboratory tests. The depopulation/repopulation method is safe, with a success rate close to 100 per cent, but it is the most expensive procedure. Partial depopulation and strategic medication is much less expensive, and with a consistent success rate close to 90 per cent for elimination of B. hyodysenteriae and M. hyopneumoniae. For eradication of A. pleuropneumoniae, the method is not reliable, with a success rate of less than 10 per cent after two years. Freedom from L. intracellularis infection after completing the eradication programme was, on average, two years.