Milk production began 6000 years ago or even earlier. The dairy animals of today have been developed from untamed animals which, through thousands of years, lived at different altitudes and latitudes exposed to natural and, many times, severe and extreme conditions. Practically everywhere on earth man started domesticating animals. As a rule herbivorous, multipurpose animals were chosen to satisfy his need of milk, meat, clothing, etc. Herbivorous animals were chosen because they are less dangerous and easier to handle than carnivorous animals. The former did not compete directly with man for nourishment, since they ate plants which man could not use himself.