Similarly, a previous study [39] has shown that compared with NBW piglets, IUGR down regulated the mRNA gene abundance of PGC-1α, Ccox V, and Cytc in the jejunum of piglets, and the gene abundance of NRF1, TFAM, ATPS were down regulated too, which was inconsistent with the present study. The gene discussed is TFAM; the disease is fetal growth restriction.