Investigation on Bacterial Growth and pH in Milk after the Expiration Date

Figure 6

Colony count at 96 hours by milk type and days after expiration when 0.3 ml milk was cultured in 3 ml of 2% agarose gel with 10% FBS in a 60 mm-diameter Petri dish. Colony numbers are the average of 4 samples, and the arrow bars indicate standard deviation. Asterisks indicate significant difference between the groups ( < 0.05 compared to fat-free milk).