As shown in Figure 4, the expression of IL-1β, IL-6, IL-8, and TNF-α mRNA in the jejunum of 21-day-old suckling IUGR piglets was significantly increased compared to normal body weight piglets (p < 0.05), while the expression of IL-10 mRNA was significantly reduced (p < 0.05). Here, CXCL8 is linked to fetal growth restriction.