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TABLE 2 Animal production in the United States and the fossil energy required to produce 1 kcal of animal protein
Livestock and animal products Production volume1 Ratio of energy input to protein output2
x 106 kcal
Lamb 7 57:1
Beef cattle 74 40:1
Eggs 77000 39:1
Swine 60 14:1
Dairy (milk) 13 14:1
Turkeys 273 10:1
Broilers 8000 4:1
1Data from US Department of Agriculture (11).
2Data from Pimentel (9).





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