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The pyruvate test for monitoring the bacteriological quality of raw silo tank milk

Published online by Cambridge University Press:  01 June 2009

Christina M. Cousins
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RG2 9AT
Ubaldina M. Rodrigues
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RG2 9AT
Rosemary J. Fulford
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RG2 9AT

Summary

Samples of milk from silo tanks were stored at refrigeration temperatures and examined at intervals for pyruvate content and total colony count. Significant relationships between pyruvate, μg/ml, and log colony forming units (cfu)/ml were established for samples stored at 2°C for 2, 3 and 4 d (3, 4 and 5 d of age respectively) but at 5 and 7°C the relationships after 2-d storage (3 d of age) were not significant. From an overall relationship it was predicted that 4 μg pyruvate/ml would correspond to a bacterial content of 3·7 x 106 cfu/ml with 95% confidence limits of 6·6 x 10 cfu/ml. 2·1 x 107 cfu/ml.

Type
Original Articles
Copyright
Copyright © Proprietors of Journal of Dairy Research 1981

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