EN
Clinical udder and laboratory milk samples examinations were performed in 2084 cows from 20 farms. There was found clinical and subclinical mastitis in 1791 quarters of 945 cows. The clinical mastitis was caused by Str. agalactiae (36,2%), Staph. aureus (14,0%), Str. dysgalactiae (12,1%), Str. uberis (10,1%), E. coli (8,2%), Staph. epidermidis (8,2%), Micrococcus sp. (3,8%), yeasts (1,9%) and other bacteria (5,3%). Agents of subclinical mastitis were: Staph. epidermidis (32,5%), Micrococcus sp. (19,9%), Str. agalactiae (15,3%), Staph. aureus (11,9%), Str. uberis (10,3%), Str. dysgalactiae (8,1%) and other microorganisms (2,0%).