As is well known, all mammals feed their infants with milk
which is produced from the female’s glands.
Humans in many cultures around the world, consume milk of mammals
like cattle and sheep, as a food product (drink the milk, eat milk products like
cheese, yogurt, butter and other). For this purpose humans grow cattle/sheep (and
others) in farms, separate the infants from their mothers, and take their milk
for human use. An example for such farm is presented in the movie below.
Each mammal produce milk which is exactly suited for its
infant needs. Therefore there are differences in the milk ingredients of
different mammas, but nevertheless there is a lot in common: generally, milk is an emulsion of oil and
water, which also includes a mixture of proteins, sugars, vitamins and minerals.
A certain time after milking, the milk is naturally
separated into its components: fat, protein, and liquid. This separation does
not spoil the milk, but creates clumps and sediment which are not considered appealing
for drinking. In order to have a uniform texture, the milk is usually homogenized:
it is being shot through a microscopic tube at very high pressure in order to
mechanically crush the big fat cells into small cells which assimilate into the
liquid and lose their ability to concentrate again. As a result, the fat is scattered
relatively equally in all parts of the milk. Such milk, is called homogenized.