육성돈의 합사 밀도가 행동에 미치는 영향

초록

This study was conducted to clarify behaviors of growing pigs between different group size (low density: 1.65 m2/pig, medium density: 0.99 m2/pig and high density: 0.76 m2/pig). The growing pigs were housed in each group size and observed with the aid of video technology for 8 consecutive hours in days 1, 20 and 40 days after mixing. Most of self-maintenance and social behaviors, exclude other self-maintenance and other social behaviors, were significantly different among group sizes. Inactive behavior was most common during the study period. The behaviors of agonistic, belly nosing, interaction with adjacent pen, tail biting and mounting were significantly higher in high density than in low and medium densities. Agonistic, belly nosing and mounting behaviors were negatively correlated with average daily gained body weight. This study reveals a higher level of aggression in high density than in low and midium densities. It is concluded that behaviors of growing pigs are critically affected by group size.

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