The objective of the present study was to determine the influence of inactivate vaccine against Mycoplasma hyopneumoniae (M. hyopneumoniae) in a pig farm with poor housing and environmental conditions. The vaccine efficacy investigation was carried out at a medium-sized pig farm. A total of 740 piglets were selected for the experiment. The piglets were divided into 2 equal groups: vaccinated and non-vaccinated. Forty-four piglets were allocated in two groups of twenty-two piglets each. The first group of twenty-two piglets was vaccinated and 14 days later it was revaccinated. The control group of twenty-two non-vaccinated piglets was injected by a placebo. Blood samples with respect to antibody formation against M .hyopneumoniae were taken at 7, 21, 35, 49, 63, 91, 119 and 147 days-of-age and investigated by ELISA. Piglet's life weights were measured individually at the age of 7, 51, 81 and 171 days during their transfer to another unit. Back fat thickness, muscle thickness and lean meat content were measured before slaughter. Pulmonary lesions caused by M. hyopneumoniae were scored at slaughter by the Goodwin method. Lungs with gross lesions were investigated microbiologically. The ELISA tests of serum showed that antibodies against M. hyopneumoniae in the vaccinated group formed after 14 days of the second vaccination and remained till the 147'h day. [n the non-vaccinated group seroconversion started on the 91't day. Dai|y weight gain (DWG) showed an increase of 33 grams (g) in vaccinated pigs compared with non-vaccinated ones. The percentage of lean meat was significantly, greater (difference 3.26%) in the vaccinated group. Greater proportion of lung surface with pneumonic lesions was detected in non-vaccinated pigs using all methods. Eight lung samples with lesions typical of M. hyopneumoniae from the non-vaccinated group were investigated microbiological|y and M. hyopneumoniae was cultured from all specimens (100%). The study demonstrates that pigs vaccinated against M. hyopneumoniae with inactivate bacteria under poor housing and environmental conditions achieved higher DWG, lean meat percentage and lower lung lesions than the pigs from the control group.
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