Eighty pigs (40 pigs per farm aged 40 days old) that had been raised on two commercial pig farms A and B were used to evaluate oxidative stress status. The results from each farm were compared to investigate a relationship between pig performance and oxidative stress status. Pig performance on farm A was relatively better than that on farm B for the period of 3 years.
The level of plasma total antioxidant status (TAS) of the pigs in group 1 (farm A) was significantly higher (p=0.045<0.05 ) than that of the pigs in group 2 (farm B). The level of plasma total oxidant status (TOS) and oxidative stress index (OSI) value of the pigs in group 2 were significantly higher (p= 0.045<0.05 and p=0.001<0.05) than those of the pigs in group 1 These results revealed that pig performance was associated inversely with oxidative stress status.

Abstract
 INTRODUCTION
 MATERIALS AND METHODS
  Pig farms
  Blood samples
  Determination of the total antioxidant status
  Determination of the total oxidant status
  Oxidative stress index
  Statistical analysis
 RESULTS
 DISCUSSION
 REFERENCES

• Kwang-Woon Kim(College of Veterinary Medicine, Chungnam National University)
• Hyun-Soo Kim(College of Veterinary Medicine, Chungnam National University) Corresponding Author