This study was conducted to clarify behavior and body weight of weaned piglets between different social experiences during suckling period. Control (no social experience) and treatment (social experience) groups of weaned piglets were housed and observed with the aid of video technology for 8 consecutive hours in early (days 1 and 2) and late (days 22 and 23) periods after mixing. Inactive, locomotion and exploration were significantly different between control and treatment groups in early mixed period. Feeding differed between groups in late mixed period. In social behaviors, agonistic and interaction with adjacent pen were significantly higher in treatment group than in control group during early mixed period. However, social behaviors dramatically decreased in late mixed period. There was negative correlation between average daily gain of body weight and agonistic behavior. In social experienced weaned piglet groups, there were less agonistic behavior and more daily gain of body weight in this study. Social experience during suckling period would be useful for stable group management in swine industry.

ABSTRACT
 Ⅰ. 서론
 Ⅱ. 재료 및 방법
 Ⅲ. 결과 및 고찰
 Ⅳ. 요약
 Ⅴ. 참고문헌

• 황현수(중앙대학교 생명자원공학부) | Hyun-Su Hwang (School of Bioresource and Bioscience, Chung-Ang University)
• 이재강(중앙대학교 생명자원공학부) | Jae-Kang Lee (School of Bioresource and Bioscience, Chung-Ang University)
• 엄태경(중앙대학교 생명자원공학부) | Tae-Kyung Eom (School of Bioresource and Bioscience, Chung-Ang University)
• 홍준기(국립축산과학원 양돈과) | Joon-Ki Hong (Swine Science Division, National Institute of Animal Science, Rural Development Administration)
• 최태정(국립축산과학원 양돈과) | Taejeong Choi (Swine Science Division, National Institute of Animal Science, Rural Development Administration)
• 임신재(중앙대학교 생명자원공학부) | Shin-Jae Rhim (School of Bioresource and Bioscience, Chung-Ang University) Corresponding author