Aleksieva V, Krushev B
Vet Med Nauki. 1981;18(3):65-71.
Studies were carried out on a total of 1459 batches of raw cow milk intended for processing with regard to the standard indices--temperature, titratable acidity, and mechanical contamination. The same batches were also investigated in terms of total bacterial contamination and coliform count. It was found that the quality of milk was good. Only 21 per cent of the investigated samples did not correspond to the standard requirements because of insufficient cooling, 0.2 per cent of the samples showed higher acidity, and 1.4 per cent were with mechanical admixtures. The total microbial content of the investigated milk varied in 52 per cent of the samples from 0.1 to 1 x 10/7cm3. It was established that microbial contamination correlated strongly with the season. The coliform count in about 27 per cent of the samples was up to 1 x 10(4), and in about 42 per cent it was above 1 x 10(5)/cm3. Highest coliform numbers were noted during the warm months. There existed a correlation between the total bacterial contamination and the amount of coliforms, which was more clearly expressed in batches of high and low bacterial count.
对总共1459批用于加工的生牛奶进行了关于标准指标——温度、可滴定酸度和机械污染的研究。还对同一批牛奶的总细菌污染和大肠菌群数进行了调查。结果发现牛奶质量良好。仅21%的被调查样本因冷却不足不符合标准要求，0.2%的样本酸度较高，1.4%的样本含有机械杂质。52%的被调查牛奶样本中的微生物总数在0.1至1×10⁷/cm³之间变化。已确定微生物污染与季节密切相关。约27%的样本中大肠菌群数高达1×10⁴，约42%的样本中大肠菌群数高于1×10⁵/cm³。温暖月份的大肠菌群数最高。总细菌污染与大肠菌群数量之间存在相关性，在高细菌数和低细菌数的批次中这种相关性表现得更为明显。
