Question

how does spoilage in milk occur

Answer 1

Answer:Spoilage of milk usually is caused by psychrotrophs that recontaminate the milk after pasteurization. Also involved are thermoduric psychrotrophs as well as heat- stable proteases produced before pasteurization. ... Yeasts usually are absent or in low numbers in milk and donot compete well with the bacteria.

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Answer 2

When milk is kept outside for very long, bacteria start turning the milk sour an hence make it unfit for consumption