THE EFFECT OF PLATE INCUBATION TEMPERATURES ON COUNTS OF SODIUM DESOXYCHOLATE-TOLERANT BACTERIA

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Abstract
Farm bulk milk samples from 54 producers were analyzed for Standard Plate Counts (SPC), thermoduric counts, and counts of bacteria that can tolerate 0.5% sodium desoxycholate (SDC). For the latter test, plates were incubated at 21, 25, 28, and 32 C for 48 hr. More milk samples had maximum counts at 25 C than at any other temperature used, whereas 32 C yielded the lowest number of colonies per plate. Median counts were 250/ml at 21, 290/ml at 25, 275/ml at 28, and 160/ml at 32 C.

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