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李芳煥,朴南鏞,金五南,徐斗錫,金永住,李採溶 全南大學校 農漁村開發硏究所 1983 農業科學技術硏究 Vol.18 No.2
Raw milk produced on 9 dairy farms which was divided into 3 catugolies as the large, middle and small by the number of milking cows kept at near from Kwang Ju area were analyzed bacteriologically from milking to the time of reception at the milk plant. And it was replicated in winter, spring and summer. 1. The number of mesophilic bacteria in raw milk after milking was average 8.1 millions cfu/ml and ranged from 30,000 to 29 millions cfu/ml during the whole season. The number of psychrophilic and thermophilic count were average 35,000 cfu/ml and 27,000 cfu/ml respectively, and ranged from 1,600 to 140,000 cfu/ml in psychrophilic flora and from 11,000 to 77,000 cfu/ml in thermophile. 2. In raw milk after cooling, the number of mesophilic, psychrophilic and thermophilic bacteria were average 16 million, 63,000 and 32,000 cfu/ml respectively. There were highly contaminated by cooling process as well as milking time. 3. The bacterial count of raw milk stored for about 10 hrs. at farm by means of their keeping condition were average 32 millions, 170,000 and 66,000 cfu/ml of mesophile and thermophile respectively. But 25.9% and 11.4% among the 27 raw milk samples produced respectively in spring and summer were more than 50 millions cfu/ml of mesophilic bacterial count. 4. As above results obtained raw milk produced by the same farm at one season or not were quite differed in bacterial contamination from the utensiles for milking or cooling. Therefore the hygenic pasteurization of utensiles and the mechanical storage at the ideal temperature were needed for the clean milk supply. 5. Mesophilic and psychrophilic microorganisms capable of dominating the population in raw milk were isolated and characterized. Of 236 cultures isolated from mesophilic group, 42,8% were species of the genera Staphylococcus, 11,4% E. coli, 9.7% Streptococcus, 34.7% Non-identified Gram's negative rods, and 1.3% Diplococcus. Of 129 cultures isolated from psychrophilic bacterial group, 23.3% were species of the Pseudomonas, 14.7% Proteus, 12.4% Enterobactor, 8.5% E. coli, and 41% Non-identified Gram's negative rods.