육성돈의 합사 밀도가 행동에 미치는 영향
Influence of Mixing Density on Behaviors of Growing Pigs
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본 연구는 돈군의 크기를 달리했을 때 육성돈의 행동 특성을 파악하기 위해 실시되었다. 돈사별 합사 밀도(6개체, 10개체, 13개체)를 달리하고 합사후 1일, 20일, 40일에 하루 8시간씩 돼지의 행동을 디지털 캠코더를 이용하여 촬영하였다. 촬영된 영상을 바탕으로 육성돈의 행동 유형별 지속시간과 빈도를 분석하였다. 휴식 행동이 전체 연구기간 동안 가장 많은 부분을 차지하였다. 기타 개체유지행동과 기타 사회 행동을 제외한 모든 육성돈의 행동은 돈군별로 유의한 차이를 보이는 것으로 나타났다. 적대 행동과 벨리 노우징, 인접한 돈방 개체와의 상호작용, 꼬리 물기 및 승가 행동은 고밀도 돈사에서 다른 돈사에 비해 매우 높았다. 육성돈의 일당증체량과 유형별 행동 사이의 관계를 분석한 결과, 적대 행동과 벨리 노우징, 승가 행동이 일당증체량과 부의 상관관계가 있었다. 고밀도 돈방에서 육성돈의 공격적 성향이 매우 높은 것으로 나타났다. 본 연구 결과 육성돈의 합사 밀도는 공격 행동을 비롯한 다양한 행동에 영향을 미치는 것으로 판단된다.
Abstract
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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