A total of 210 dairy cows of Seongw han area were epidemiologically investigated for mastitis by Milk Quality Test(MQT) method. Milk samples from cows infected with mastitis were also bacteriologically studied.
Seventy four (42.5%) of 174 dairy cows were positive for mastitis and fifty nine (79.7%) among them were infected with subclinical mastitis and fifteen (20.3%) were clinical mastitis.
High infective rate were shown on August (48.7%) and July (45.7%) and it was lowered on Decermber(35.8%).
The incidence rate of subclinical mastitis for herd shown tendency of increase at the barn in which located on lower place (30.7∼43.9%), whereas, the barn in which was on higher place and with bucket type milking system shown tendency of decrease causative organisms.
A. total of 230 strains of etiological agents were isolated from 578 infected duarters which shown MQT score (+) or more. The relevant causative organisms isolated in this study were Staphylococcus aureus (18.3%), Staphylococcus epiderm idis (16.9%), fungi (16.5%), Pseudomonas aeruginosa (15.2%), Escherichia coli (7.8%) and Serratia m arcescens(2.27), respectively.
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