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IV. Major Livestock

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Facts and Figures

1. World livestock populations

Table 1. Total world population, per individual energy consumption, total global energy use by humans and domestic livestock (Brown, 1995; Wright, 1990)

Species Total population
(billions) 		Energy use/individual
(GJ/yr) 		Total energy use
(EJ/yr)
Humans 5.50 4 22.0
Cattle 1.27 47 59.7
Buffalo 0.14 68 9.5
Sheep 1.15 7.9 9.1
Pigs 0.82 10 8.2
Chickens 9.35 0.62 5.8
Goats 0.49 6.1 3.0
Horses 0.07 41 2.7
Other
livestock 		0.07 40 3.0

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Cited Literature and Links

Brown, J.H. 1995. Macroecology. University of Chicago Press.

Wright, D.H. 1990. Human impacts on energy flow through natural ecosystems and implications for species endangerment. Ambio 19: 189-94

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