InVet. 2016, 18 (1): 33-41 ISSN 1514-6634 (impreso) INFECCIÓN DE ...
Control of swine enzootic pneumonia (EP), a disease caused by Mycoplasma hyopneumoniae, is mainly through vaccination. Three herds with different vaccination schedules against this agent were studied in order to determine the infection dynamics. A group of 250 pigs from each herd were followed over...
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| Autores principales: | , , , , |
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| Formato: | Artículo publishedVersion |
| Lenguaje: | Español |
| Publicado: |
Universidad de Buenos Aires. Facultad de Ciencias Veterinarias.
2016
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| Materias: | |
| Acceso en línea: | http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=pveterinaria/invet&cl=CL1&d=HWA_3202 https://repositoriouba.sisbi.uba.ar/gsdl/collect/pveterinaria/invet/index/assoc/HWA_3202.dir/3202.PDF |
| Aporte de: |
| Sumario: | Control of swine enzootic pneumonia (EP), a disease caused by Mycoplasma hyopneumoniae, is mainly through vaccination. Three herds with different vaccination schedules against this agent were studied in order to determine the infection dynamics. A group of 250 pigs from each herd were followed over time from weaning to slaughter, measuring daily weight gain and percentage of cough (at the end of weaning and finishing stages). Thirty pigs were sampled from each group at 9, 15 and 23 weeks of age to determine the percentage of seropositives. In addition, 30 pigs from the different groups were sacrificed at 6 and 12 weeks of age, respectively, to detect the presence of the agent by PCR in nasal swab (NS) and broncho-alveolar lavage (BAL) samples and for macroscopic and microscopic lung lesions evaluation. In each group, the lungs of the remaining animals were inspected at slaughter for the same purpose. Lung affected area and proportion of PCR positives were significantly higher (p <0.05) at slaughter. Proportion of PCR positives was significantly higher (p <0.05) in BAL vs HN samples. Different serological profiles were found on each herd. It was concluded that the dynamics of infection in each farm should be evaluated before M. hyopneumoniae vaccination. |
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