京畿一圓 乳牛의 乳房炎 感梁率과 原乳의 細菌 및 體細胞數 測定에 따른 乳質 汚染度에 關한 硏究

A Study on Mastitis Infection Rate and Investigation of Milk Contamination Level by Measuring the Bacteria and Somatic Cell Counts in Gyunggi Area

This study was conducted for the improvement of milk quality and milk hygiene in public health point of view. Investigation of mastitis infection rate, isolation and identification of causative microorganisms in CMT positive milk, investigation of milk contamination level by measuring the bacteria and somatic cell counts and investigation of dairy management in farms were performed on 1.605 quarters milk of 434 cows of 20 dairy farms in Gyunggi-area from September 1983 to March 1984. The results were summarized as follows : 1. Sixteen (3.7%) of 434 cows were found to be infected with clinical mastitis. 234 (53.9%) of 434 cows and 608(37.9%) of 1, 605 quarters were found to be infected with subclinical mastitis. 2. The causative microorganisms isolated were Staphylococcus aureus (38.3%), Staphylococcus epidermidis(21.0%), Micrococci(13.6%), Streptococcus spp. (12.3%), E. coli (7.4%), Fungus & Yeast (1.6%) and others (5.8%). 3. Total numbers of bacteria were 9.2×10⁶ to 1.21×10⁷/ml(av. 1.805×10⁷/ml), numbers of coliform bacteria were 4.1×10⁵ to 9.4×10⁵/ml(av. 7.05×10⁵/ml) and somatic cell counts were 4.8×10⁵ to 1.52×10⁶ cells/ml (av. 9.5×10⁵ cells/ml) in bulk milk. 4. As comparing with CMT score of +, ++ and +++, somatic cell counts were 3.4×10⁵ to 1.64×10⁶ cells/ml (av. 6.41×10⁵cells/ml), 5.4×10⁵ to 2.75×10⁶ cells/ml(av. 1.762×10⁶ cells/ml) and 1.97×10⁶ to 9.75×10⁶ cells/ml(av. 7.781×10⁶ cells/ml), respectively. 5. In investigation on dairy management, performance of dry cow therapy, teat dipping after milking, disinfection of milking machine at every milking, replacement of milk liner within 6months and opportunity of acquirement for the mastitis control techniques by dairy education were 65%, 40%, 45%, 55% and 50% in 20 dairy farms, respectively.