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Effect of Housing Systems of Cage and Floor on the Production Performance and Stress Response in Layer

계사 사육 형태가 산란계의 생산성과 스트레스 반응에 미치는 영향

  • Sohn, Sea-Hwan (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology) ;
  • Jang, In-Surk (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology) ;
  • Son, Bo-Ram (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
  • 손시환 (경남과학기술대학교 동물생명과학과) ;
  • 장인석 (경남과학기술대학교 동물생명과학과) ;
  • 손보람 (경남과학기술대학교 동물생명과학과)
  • Received : 2011.09.28
  • Accepted : 2011.10.28
  • Published : 2011.12.31

Abstract

This study was conducted to investigate the effects of housing systems on the productivity and physiological response as stress indicators in White Leghorn chickens. The chickens subjected to the conventional cages had a significantly lower viability, hen-housed egg production, egg weight and body weight compared with those to the floor pens. However, the hens housed in the conventional cages had a shorter day of the first egg and a greater egg quality compared with those housed in the floor pens. In addition, this study was also investigated to identify biological markers for assessing the physiological response of chickens under stress conditions. As biological markers, the amount of telomeric DNA was analyzed by quantitative fluorescent in situ hybridization on the nuclei of cells. The DNA damage rate of lymphocytes was also quantified by the comet assay. The amount of telomeric DNA of the lymphocytes, kidney and spleen was significantly higher in the chickens under floor pens than those under conventional cages. The DNA damage also increased in chickens raised under conventional cages, as compared to the chickens under floor pens. As results, we conclude that the chickens housed in conventional cages have a greater stressful status than those housed in floor pens.

계사 사육 형태에 따른 닭의 스트레스 정도를 알아보기 위하여 단관백색레그혼종을 대상으로 케이지 사육 및 평사 사육으로 관리 후 이들의 생산 능력과 스트레스 관련 표지를 비교 분석하였다. 개체의 생산 능력에 있어 생존율, 산란 지수, 난중 및 체중은 평사 사육군이 케이지 사육군에 비해 유의하게 높은 성적을 보였고, 반면 초산 일령 및 난질의 경우 케이지 사육군이 양호한 결과를 나타내었다. 사육 형태에 따른 닭의 스트레스 관련 표지로 형광접합보인법에 의한 텔로미어 함량 분석 및 comet assay에 의한 DNA 손상율을 비교 분석하였다. 텔로미어 함량 분석 결과, 혈액 세포 및 신장, 비장 세포의 경우 평사 사육군이 케이지 사육군에 비해 유의하게 높은 텔로미어 함유율을 보이고, 연령이 증가함에 따라 이의 차이는 더욱 커지는 것으로 나타났다. DNA 손상율은 케이지 사육군이 평사 사육군에 비해 유의하게 높은 손상율을 나타내어 케이지 사육이 평사 사육에 비해 훨씬 높은 스트레스 상태임을 알 수 있었다. 따라서 생존율을 포함한 생산 능력과 스트레스 표지 분석 결과, 산란계에 있어 케이지 사육 방식이 평사 사육 방식보다 개체들에게 생리적 스트레스 요인이 상대적으로 큰 것으로 사료된다.

Keywords

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