Androstenone is a testicular steroid with no hormonal activity produced in mature male pigs in parallel with anabolic hormones (see figure 4). Some androstenone accumulates in the back-fat (adipose tissue) and produces boar taint when heated. The levels of androstenone are regulated by the stage of puberty and the individual ability of the animal to synthesize and metabolize androstenone. In the regulation of androstenone levels, dietary factors are believed to be less important than for the skatole levels.