Table 1.

Fossil energy estimates to produce 1 kcal of animal protein¹

Animal product	Fossil energy input (kcal):protein produced (kcal)
Broilers	4:1
Turkeys	10:1
Dairy (milk)	14:1
Swine	14:1
Beef cattle	40:1
Lamb	57:1

¹Adapted with permission from (82).