Q8. Freshly collected cow's milk spoils within a few hours at room temperature but the milk
packed in a tetra pack stays fresh for a longer period of time. Give reason.
Answers
The freshly collected cow’s milk has some bacteria and that is why it gets spoiled in a few hours unless it is boiled and cooled. After boiling and cooling, the milk stays good for a few more hours. If boiled, cooled and kept in the fridge, it stays good for a few more days.
Milk packed in sachets actually have a life of about 7 or 8 days because they have been pasteurised, packed in fairly aseptic packing and of course kept refrigerated all through till they are delivered to the consumers.
Answer:
If it's fresh milk, you should consume it in less than three days.If it's pasteurized milk, which is much more likely, it'll be unaffected.Signs of spoilage are a sour smell and sour taste. You should make a habit of always smelling your milk (food) before drinking (eating) it. If it doesn't smell like you'd expect, taste it. If it doesn't taste like you'd expect, ditch it.
Milk is cultivated with lactobacillus, a bacteria that's beneficial for us. So, even though milk may taste sour, it doesn't mean that it's undrinkable. In Holland, there's sour-milk (karnemelk), that some people consume.
Under the right circumstances, milk will turn into yogurt, thanks to the lactobacillus