As shown in Figure 4, compared with the NBW finishing pigs, the protein expressions of Keap1, P62 and LC3B/A were upregulated in the jejunal mucosa of IUGR finishing pigs (P < 0.05), while no significant changes in protein expressions of total Nrf2 and nuclear Nrf2 of jejunal mucosa were observed between the NBW and IUGR groups (P > 0.05). This evidence concerns the gene MAP1LC3B and fetal growth restriction.