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Nomadic pastoralism seems to have developed first as a part of the secondary-products revolution proposed by Andrew Sherratt, in which early pre-pottery Neolithic cultures that had used animals as live meat ("on the hoof") also began using animals for their secondary products, for example: milk and its associated dairy products, wool and other animal hair, hides (and consequently leather), manure (for fuel and fertilizer), and traction.[citation needed]