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A COMPARISON OF ROLL‐TUBE AND PETRI DISH COLONY COUNTS ON RAW MILK
Author(s) -
CLEGG L. F. L.,
THOMAS S. B.,
COX C. P.
Publication year - 1951
Publication title -
proceedings of the society for applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0370-1778
DOI - 10.1111/j.1365-2672.1951.tb04631.x
Subject(s) - petri dish , tube (container) , replicate , statistical analysis , zoology , raw milk , raw material , mathematics , biology , food science , materials science , statistics , composite material , ecology , microbiology and biotechnology
SUMMARY: A co‐ordinated experiment was carried out at two centres, in which colony counts from raw milk samples determined by the roll‐tube and Petri dish methods were compared. A bulk medium was standardized for both laboratories, as also were details of technique. Statistical analyses showed that roll‐tube counts were generally lower than the corresponding Petri dish counts, but the difference varied considerably from milk to milk. The variation between replicate sub‐samples was about the same for both methods. Experience and the results both indicate that roll‐tubes were slightly more difficult to count than Petri dishes.