by Joseph K. Campbell
What are the sources of power for field work in the world? According to the FAO (Food and Agriculture Organization of the United Nations), there are approximately 16.9 million agricultural tractors and 267.4 million horses, mules, asses, water buffalo, and camels in the world. Of course many of these animals are used for transportation, but a large proportion of them are used as draft animals. There are also estimated to be 1,200,000,000 tattle in the world. Most of the cattle are used for meat and milk, with only a few used as draft tows or draft oxen. The distribution of the animals is shown in Table I.
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