Hillerton J E, Walton A W
Milking and Mastitis Centre, Agricultural and Food Research Council Institute for Animal Health, Compton, Newbury.
Vet Rec. 1991 Jun 1;128(22):513-5. doi: 10.1136/vr.128.22.513.
A hand-held, commercially available instrument for measuring the electrical conductivity of milk (the Milk Checker) has been examined for its usefulness and accuracy in detecting subclinical and clinical mastitis. Foremilk from uninfected quarters had an electrical conductivity of 5.4 to 5.6 millisiemens (mS)/cm. Milk from cows with subclinical Staphylococcus aureus infections had a higher milk conductivity (7.1 to 7.5 mS/cm) but milk from cows with subclinical S uberis infections showed no increase in conductivity (5.3 to 5.6 mS/cm). However, experimental S uberis infections could be detected by a 50 per cent increase in the electrical conductivity of foremilk two milkings before visible signs of mastitis were apparent. The equipment could be a useful advisory/veterinary tool but is unlikely to be used routinely in the milking parlour.
一种用于测量牛奶电导率的手持式商用仪器（牛奶检测仪），已对其在检测亚临床和临床乳腺炎方面的实用性和准确性进行了检验。未感染乳腺的前奶电导率为5.4至5.6毫西门子（mS）/厘米。患有亚临床金黄色葡萄球菌感染的奶牛所产牛奶的电导率较高（7.1至7.5 mS/厘米），但患有亚临床乳房链球菌感染的奶牛所产牛奶的电导率未升高（5.3至5.6 mS/厘米）。然而，在乳腺炎可见症状出现前两次挤奶时，通过前奶电导率增加50%可检测到实验性乳房链球菌感染。该设备可能是一种有用的咨询/兽医工具，但不太可能在挤奶厅常规使用。
