Etiology, Course and Reduction of Incidence of Environmental Mastitis in the Herd of Dairy Cows

The work was aimed at the observation of the incidence and course of environmental mastitis in the breeding with a mean number of 177 dairy cows free housed and milked in the milking parlour after introduction of anti-mastitis measures. During 6 months of application of preventive inhibitory methods the incidence of bacteriological positive dairy cows was reduced from 72.99 % to 6.74 %, and occurrence of dairy cows with clinically apparent form of mastitis decreased from 23.00 % to 0.56 %. The main etiological agents of intra-mammary infections were bacteria Streptococcus sp., Arcanobacterium pyogenes and coagulase–negative staphylococci. The overall efficacy of the preparation synulox LC used for the treatment of intra-mammary infections ranged from 88.71 % to 96.15 %. Streptococcus sp. bacteria were 100% sensitive against combination of amoxycilin with clavulanat. Arcanobacterium pyogenes bacteria showed the sensitivity of 93.6 %, whilst the sensitivity of coagulase-negative staphylococci bacteria was at 90.0 %.