[Immunity in genital bacterial infections in cows]

A total of 313 cows were investigated in order to establish the agents that most frequently caused genital diseases in cows on 5 farms where the experiments were carried out. In animals that had miscarried as well as in those that had recovered from metritis specific antibodies were found against the isolated causative agents, having titers in the vaginal mucus from 1:160 to 1:320, and in the blood serum--from 1:160 up to 1:1280. Strains were selected from the most frequently isolated bacterial species to produce a killed polybacterial adsorbate baccine. It was used 152 cows on the same farms in the eighth month of first or second gestation. The treated animals built immunity of a varying intensity, which was demonstrated with the appearance of specific antibodies of titers in the vaginal mucus ranging from 1:80 to 1:640, and in the blood serum--from 1:80 to 1:1280, and with marked resistance against the bacterial agents used in the vaccine.