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Effect of heat stress (HS) and melatonin on expression of HSP70, NRF2, CDK1 and GDF9 mRNA in the porcine oocytes during in vitro maturation (IVM). (A): effect of HS and melatonin on the oocytes during IVM at 4 h; (B): effect of HS and melatonin on the oocytes during IVM at 18 h; (C): effect of HS and melatonin on the oocytes during IVM at 42 h. Different letters: a,b,c in the different patterned columns represent significant difference (p < 0.05).
