The use of animals for their renewable products greatly increased human capabilities in prehistory. Secondary products – or anything that can be gleaned from a domestic animal repeatedly over its lifetime – expanded the capabilities of ancient human societies. They helped to provide enough food and labour surplus to make possible the first ancient civilisations. Apart from their meat, bones and skin, animals gave ancient people vital goods such as their milk and wool. The ability to repeatedly harvest milk from an animal over its lifetime more than doubled the calories that it could contribute to the human diet. The ability to harvest wool from sheep allowed humans to grow a source of meat as well as warm and durable clothing. At some point in prehistory, humans learned that domesticated cattle could pull burdens far greater than humans alone could manage.
Even after decades of archaeological research, the specific origins…
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