Describe different factors which increase the growth of microorganisms in milk. Explain how microbial spoilage of milk can be controlled.

Milk is a highly nutritious liquid that provides an excellent environment for the growth of various microorganisms, including bacteria, yeasts, and molds. The growth of these microorganisms in milk depends on several factors that influence their multiplication and activity, thereby affecting the quality and safety of milk.

One of the primary factors that increase microbial growth in milk is temperature. Milk is often stored at ambient temperatures for some time before refrigeration, and warm temperatures (between 20°C to 40°C) provide optimal conditions for bacterial growth. Many bacteria, especially psychrotrophic bacteria, can multiply rapidly at temperatures above 7°C, causing spoilage. Cooling milk quickly and storing it at refrigeration temperatures (around 4°C) significantly slows down microbial growth.

Another factor is the initial microbial load present in the milk. Milk collected under unhygienic conditions or from animals with infections like mastitis contains a high number of microorganisms. Poor sanitation during milking, handling, and storage can introduce contaminants ____ _______ ____ __________ _______ ________ ________ ________ ____ _________ _____.
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