For that animal, it also depends on the quality of the oil. In practical application, it is generally a mixture of animal oil and vegetable oil. For broilers, the metabolic energy of soybean oil is 8370, that of corn oil is 88 10 and that of chicken oil is 88 19. But the metabolic energy of chicken oil in laying hens is 90 10. The digestibility of pigs is about 852 1-7983.