摘要
对2611份乳区奶样进行了电导率和体细胞含量测定。其中232份奶样,测定了它们在4～45℃温度范围的电导率,1172份奶样进行了细菌学分离鉴定。结果表明,牛奶的电导率随体细胞含量的升高而增加。体细胞含量在0～2.5×10~5/ml之间的1479份奶样的电导率为7.01±0.17mS/cm。但牛奶温度变化对电导率有显著影响,其温度系数是0.13mS/cm/℃。感染了主要病原菌金黄色葡萄球菌的奶样,其电导率和体细胞含量明显高于未感染乳样(P<0.01),而感染了非主要病原菌表皮葡萄球菌和牛棒状杆菌的奶样,其电导率和未感染奶样比较无显著差异。对于主要病原菌感染的奶样,相对电导率比绝对电导率有较高的检出率。
Somatic cell counts(SCC) and electrical conductivity (EC) were measured in 261J quarter milk samples from 673 cows on five dairy farms in Hangzhou region,232 samples of which were determined for EC in the temperatures ranging from 4° to 45℃,and 1172 samples of which were cultured for bacteriological examination. These results indicated that milk EC elevated with increased SCC. The mean EC of 1479 milk samples with 0~2.5×105 somatic cells/ml was 7.01 ±0.17mS/cm. EC was remarkably influenced ly the changes of milk temperature, the temperature coefficient of which was 0.13mS/cm/℃. The SCC and EC of milk samples from the quarters affected by primary pathogens such as Staph, aureus and Strep, agalactiae were much higher than uninfected milk samples(P<0.01).
出处
《中国兽医科技》
CSCD
1993年第6期11-13,共3页
Chinese Journal of Veterinary Science and Technology
基金
国家自然科学基金
