SLC38A1 and fetal growth restriction: As shown in Figure 1, the mRNA expression of glucose transport related genes (GLUT1 and GLUT3), amino acid transport related genes (SNAT1 and SNAT4), and angiogenesis gene VEGFA in the placenta of IUGR piglets (from control sows) were significantly lower than those in the placenta of normal piglets (from control sows) (p < 0.05); However, the expression of GLUT1, GLUT3 and VEGFA mRNA in the placenta of IUGR piglets (from COS sows) was significantly higher than that in the placenta of IUGR piglets (from control sows) (p < 0.05).