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第25号公告板 - Summer 2006
BacterologyMycoplasma hyopneumoniae
FANO E, PIJOAN C, DEE S
Mycoplasma hyopneumoniae prevalence at weaning as a predictor of the group’s subsequent Mycoplasma status.
Allen D. Leman Swine Conference ? Proceedings, 2005: 109-113
Lactation is a key period for the spread of Mycoplasma hyopneumoniae during which piglets can be infected by vertical transmission. Three sow herds with similar management were involved in this study in order to investigate three aspects presumably correlated to the nasal prevalence of M. hyopneumoniae at weaning, i.e. seroconversion at the end of the growing period, the prevalence of M. hyopneumoniae in bronchial swabs at slaughter, as well as the frequency and severity of lung lesions caused by M. hyopneumoniae. The correlation assessment was based on twenty groups of piglets, each consisting in a one-week production. In each group, the initial and final prevalence of M. hyopneumoniae was determined by nested-PCR from nasal and bronchial swabs respectively. The initial prevalence of M. hyopneumoniae ranged from 2.5 to 51.28% with important fluctuations between the various groups. The nasal prevalence of M. hyopneumoniae at weaning resulted positively correlated to both the frequency and severity of lung lesions, to the level of seroconversion and to the prevalence of M. hyopneumoniae in bronchi. For a group a piglets, the prevalence of M. hyopneumoniae at weaning is thus highly predictive of the severity of the disease they will develop subsequently. These results confirm that means of control should be focused on sows in order to lower the microbial pressure on piglets and reduce the use of vaccines and medicated feed afterwards during the growing period.
