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Journal of Dairy Science Vol. 51 No. 11 1776-1780
© 1968 by American Dairy Science Association ®
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Churning in Raw Milk Samples and Its Effect on the Fat Test1

Manfred Kroger, D. T. Landis, R. J. Dewar and H. C. Gilmore

Department of Dairy Science, The Pennsylvania State University, University Park

ABSTRACT

Shipping or mailing milk samples, specifically those of Dairy Herd Improvement Associations, over long distances to centralized laboratories has rekindled interest in looking at the problem of churning. Churning causes loss or unavailability of fat in the fat determination. By simulating and exaggerating transportation motion it was shown that no churning was caused when sample bottles were completely filled or when the temperature was below 10 C, even with partially fllled containers. Churning increased with time and with container head space. Of several additives tested, only sodium metaphosphate was effective in reducing churning, but not completely.

FOOTNOTES

1 Authorized for publication on June 27, 1968, as Paper no. 3437 in the Journal Series of the Pennsylvania Agricultural Experiment Station.






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Copyright © 1968 by the American Dairy Science Association ®.