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Fifty-four multiparous large white sows were used to determine the effects of supplementing oregano essential oil (OEO) to the gestation and lactation diets on oxidative stress status, lactation feed intake, and their piglet performance. Two groups were fed diets with (OEO;  n  = 28) or without (Control;  n  = 26) supplemental 15 mg/kg OEO during gestation and lactation. The serum levels of reactive oxygen species (ROS) ( P  < 0.05), 8-hydroxy-deoxyguanosine (8-OHdG) ( P  < 0.05), and thiobarbituric acid reactive substances (TBARS) ( P  < 0.05) were higher during gestation (days 90 and 109) and lactation (days 1 and 3) than in early gestation (day 10). Compared with the control group, the OEO diet significantly reduced sows' serum concentrations of 8-OHdG ( P  < 0.05) and TBARS ( P  < 0.01) on day 1 of lactation. The OEO diet increased the sows' counts of faecal  lactobacillus  ( P  < 0.001) while reducing  Escherichia coli  ( P  < 0.001) and  Enterococcus  ( P  < 0.001). In the third week of lactation the treatment tended to increase sow's feed intake ( P  = 0.07), which resulted in higher average daily gain ( P  < 0.01) of piglets. Our results demonstrated that there is an increased systemic oxidative stress during late gestation and early lactation of sows. The OEO supplementation to sows' diet improved performance of their piglets, which may be attributed to the reduced oxidative stress.

Effects of Dietary Supplementation of Oregano Essential Oil to Sows on Oxidative Stress Status, Lactation Feed Intake of Sows, and Piglet Performance