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第18号公告板 - Spring 2004
BacterologyMycoplasma hyopneumoniae
SIBILA M, CALSAMIGLIA M, VIDAL D, BADIELLA L, ALDAZ, A, JENSEN JC
Dynamics of Mycoplasma hyopneumoniae infection in 12 farms with different production systems.
The Canadian Journal of Veterinary Research, 68, 2004, 12-18
Twelve Spanish farms experiencing respiratory problems were included in this study. These herds differed according to their production system (one to two-site systems or three-site systems) as well as the use of vaccination and medicated feed (either one, both or none of them). In all of the herds the presence of M. hyopneumoniae was demonstrated. However, the percentage of positive pigs varied greatly from farm to farm and M. hyopneumoniae was not necessarily the agent responsible for the respiratory manifestations. The dynamics of infection of three-site systems on one hand and one to two site systems on the other hand are clearly distinct: three-site systems seems to hamper vertical transmission of M. hyopneumoniae (lower nursery colonization) but are subjected to more acute outbreaks in late finishing pigs. The prevalence of M. hyopneumoniae was anyway lower in three-site systems. The type of the farm influences M. hyopneumoniae colonization and seroconversion to a great extent.
