Abstract
Twenty-seven raw milk samples were analyzed for their bacterial quality by the Standard Plate Count (SPC) and the plate loop count (PLC). All resultant plates were counted by three different technicians either manually or with a 3M Brand Automatic Colony Counter, Model 630. Results emphasize the superiority of the SPC over the PLC for samples with high bacterial numbers. The automatic colony counter tended to underestimate the number of colonies on a plate. Correction factors for conversion of PLC counts to SPC and automatic to manual counts were calculated. It is recommended that the PLC and the automatic colony counter be used with appropriate correction factors for routine analysis of large numbers of samples.
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