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Domestication of animals is more than taming. Their habitat is restricted, protection assured, food supply maintained, and most important, breeding farm animals is done under human management and control.
In general animals have been domesticated for the following three purposes: as a source of food, clothing, etc, as assistants used in various human activities, or as pets.
The usefulness of animals domesticated may vary. For instance, European and many other peoples breed cows for obtaining milk and beef, but the Chinese do not milk cows, and Hindus do not eat beef.
Domestication of cattle has had varying degrees of success, from half-wild buffaloes to the tame British Jersey.
Now they differ considerably in colour, form, size, etc. from their related wild forms.
The origin of domestication is unknown.
Domestication of animals is more than taming.