In fact, the SOD expression level in the liver of the treatment group decreased to varying degrees, but it increased to varying degrees in the heart, which may be caused by the change of SOD level in the blood, the maintenance of balance in the body, or that the use of iron additives caused a certain load on the liver of newborn piglets, but no liver diseases were observed in piglets in the same litter (not slaughtered, raised on the farm). This evidence concerns the gene SOD1 and liver disorder.