What portion (s) of a whole grain is/are susceptible to spoilage?

Germ or embryo is the smallest portion of the grain, and the embryo for a future plant found at the base of the whole grain or kernel that accounts for 2.5 percent of the grains weight. It is very rich in fat, vitamins, minerals, incomplete protein and an excellent source of B vitamins and vitamin E which is collected and sold separately and makes the whole grains susceptible to spoilage.