Abstract
The purpose of this research was to isolate and identify non-temperature sensitive (ts-) (≥39.5 °C insulation), vaccine Mycoplasma synoviae (MS) strains from laying breeder hens vaccinated with temperature sensitive (ts+) strains ( 0.05). This investigation demonstrated the reversal of the thermosensitivity, pathogenicity, and vertical transmission of the MS−H strain.
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