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Journal of Dairy Science Vol. 67 No. 7 1510-1516
© 1984 by American Dairy Science Association ®
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Portable Conductivity Meter for Detecting Abnormal Milk1

L. M. Okigbo, M. A. Sheliah2, G. H. Richardson, C. A. Ernstrom, R. J. Brown and E. L. Tippetts3

Department of Nutrition and Food Sciences, Utah State University, Logan 84322

ABSTRACT

A hand-held conductivity meter was designed for cow-side detection of abnormal milk. Each instrument contains a single flow cell and four sealed push-button switches to select individual quarters. The instrument can be configured for examining Holstein or Jersey type milk by adjusting tube length. Each quarter reading is displayed immediately on a liquid crystal digital display and is comparable with other quarter readings.

Milk samples from 626 individual quarters (162 cows) were collected from two Holstein and two Jersey herds and tested with the hand-held conductivity meter. Samples also were analyzed for somatic cells, fat, protein, lactose, pH, total bacterial count, and predominant bacterial groups. The correlation between conductivity and lactose was largest and negative. Somatic cell count, protein, and pH were positively correlated with conductivity. Correlations of conductivity were the highest in the herd with largest incidence of abnormal milk. The meter classified correctly more quarters with abnormal milk than any measure in discriminant analysis when quarters were classified into presence or absence of abnormal milk.

FOOTNOTES

1 Contribution number 2883 of the Utah Agricultural Experiment Station. Approved by the Director.

2 Visiting scientist from University of Cairo, Cairo, Egypt.

3 Wescor, Inc., 459 S. Main, Logan, UT 84321.






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Copyright © 1984 by the American Dairy Science Association ®.