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Many external factors bring about spoilage of fresh milk or fresh juice when it is not stored in refrigerator for 2 or 3 days. The following are some of them.

1. Defective storage mechanisms

2. Temperature and humidity

3. Micro organisms

4. Insects or Pests

5. Rodents and birds

Fresh milk or juice has a brief shelf-life which gets spoiled as it is having microbes which are alive at room temperature. Microbes in the milk will be inactive if the temperature is above 60o C (Boiling) and below 5o C (Freezing)