Because sows are industrially vital for swine production, monitoring for their health or disorder status is important to ensure high reproductive performance. Especially, ambient temperature changes in different season, especially during summer, are directly influenced to the reproductive performance of sows. Although the serum biochemical parameters are widely applied in the veterinary medicine with wide ranges for the physiological process, the values are also influenced by several factors such as age, breed, gender, and stress. In addition, domestic sows in Koreaspecific reference interval (RI) for serum biochemistry has not been established yet. Therefore, the present study was aimed to evaluate seasonal variation of RIs in the serum biochemistry in domestic sows in Korea at different seasons and to establish normal RIs using a RI finding program (Reference Value Advisor). Significant difference (p < 0.05) on the different seasons were identified in several serum biochemical parameters including BUN, CRE, GGT, GLU, ALB, TP, LDH and Na in sows. Therefore, we further established RIs, specific in domestic sows in Korea regardless of season. The established RIs based on the serum biochemical values provide a baseline for interpreting biochemical results in the domestic sows in Korea, regardless of seasonal effect. It may contribute to develop a strategy for better reproductive performance by improving breeding management practice and evaluating health of pig herds, which facilitate to avert the economic loss in summer infertility in sows.

ABSTRACT
INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
CONCLUSION
REFERENCES

• Dongyub Kim(College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Korea)
• Hwan-Deuk Kim(College of Veterinary Medicine, Kyungpook National University,Department of Veterinary Research, Daegu Metropolitan City Institute of Health & Environment,)
• Youngmin Son(College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Korea)
• Sungho Kim(College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Korea)
• Min Jang(College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Korea)
• Seul-Gi Bae(College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Korea)
• Sung-Ho Yun(College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Korea)
• Seung-Joon Kim(College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Korea)
• Won-Jae Lee(College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Korea) Corresponding author