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This study evaluated the effects of different concentrations (1, 10, 25, 50, and 100 µM) of the antioxidant  N -(2-mercaptopropionyl)-glycine (NMPG), during the culture of in vitro-fertilized porcine oocytes. While the highest concentrations of NMPG (50 and 100 µM) were toxic to the developing embryos during the first two days of culture, 25 µM NMPG achieved cleavage rates that were similar to those achieved by the control but did not sustain blastocyst production by Day 7 of culture. Compared to the control culture medium, the culture medium supplemented with 10 µM NMPG increased ( P  < 0.05) the rates of blastocyst formation, decreased ( P  < 0.05) the intracellular levels of reactive oxygen substances, and downregulated ( P  < 0.05) the expression of the oxidative stress related gene GPX1. In conclusion, these results demonstrated that supplementation of porcine embryo culture medium with 10 µM NMPG can attenuate oxidative stress and increase the yield of in vitro production of blastocysts.

N-(2-mercaptopropionyl)-glycine enhances in vitro pig embryo production and reduces oxidative stress