Milk, which is one of the chief sources of calcium, is highly nutritious and constitutes a part of our daily diet in some form or the other. The main constituents of milk are water, proteins, lipids, carbohydrates, vitamins and minerals, which are essential for growth and development. Milk also contains various biologically active compounds such as caseins and whey proteins. Of the total whey solids, it is estimated that about 75% is lactose. Milk is available as full cream, skim, lactose-free and fat free milk. Condensed and evaporated milk, which can be pasteurized