scientific biological mechanism diagram for journal theriogenology, clean vector style, white background, horizontal signaling pathway schematic. exogenous d‑chiro‑inositol (dci) at left. dci decreases ros level, increases gsh level to alleviate oxidative stress. dci activates mapk‑erk signaling pathway. mapk‑erk has three downstream branches: 1. upregulates rps6ka1, cdk1, cdc25b to promote oocyte meiotic resumption; 2. upregulates mrpl10, mcu, cracr2b to improve mitochondrial function, increase mitochondrial membrane potential and atp production; 3. upregulates hif‑1α, pfkfb3, glut1 to enhance glycolysis. three branches converge to final phenotype: improved porcine oocyte in‑vitro‑maturation quality and enhanced early embryonic developmental competence. use standard arrows for activation, t‑bar for inhibition. gene names in italic font. minimal text, high clarity, no extra decorations, suitable for scientific publication.