Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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The Effect of Stocking Density and Strain on the Performance and Physiological Adaptive Responses in Broiler Chickens

육계에서 품종 및 사육 밀도가 생산성 및 생리적 적응성 지표에 미치는 영향

  • Jang, In-Surk (Department of Animal Science & Biotechnology, Gyeongnam National University of Science and Technology) ;
  • Yun, Seo-Hyun (Department of Animal Science & Biotechnology, Gyeongnam National University of Science and Technology) ;
  • Ko, Young-Hyun (Department of Animal Science & Biotechnology, Gyeongnam National University of Science and Technology) ;
  • Kim, Se-Yun (Department of Animal Science & Biotechnology, Gyeongnam National University of Science and Technology) ;
  • Song, Min-Hye (Department of Animal Science & Biotechnology, Gyeongnam National University of Science and Technology) ;
  • Kim, Jong-Sun (Department of Animal Science & Biotechnology, Gyeongnam National University of Science and Technology) ;
  • Sohn, Sea-Hwan (Department of Animal Science & Biotechnology, Gyeongnam National University of Science and Technology) ;
  • Moon, Yang-Soo (Department of Animal Science & Biotechnology, Gyeongnam National University of Science and Technology)
  • 장인석 (경남과학기술대학교 동물생명과학과) ;
  • 윤서현 (경남과학기술대학교 동물생명과학과) ;
  • 고영현 (경남과학기술대학교 동물생명과학과) ;
  • 김세윤 (경남과학기술대학교 동물생명과학과) ;
  • 송민혜 (경남과학기술대학교 동물생명과학과) ;
  • 김종선 (경남과학기술대학교 동물생명과학과) ;
  • 손시환 (경남과학기술대학교 동물생명과학과) ;
  • 문양수 (경남과학기술대학교 동물생명과학과)
  • Received : 2014.08.18
  • Accepted : 2014.09.16
  • Published : 2014.09.30
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Abstract

The aim of this study was to determine the effects of stocking density and strain on the performance and physiological adaptive responses including the plasma corticosterone content and the level of mRNA expression of pro-inflammatory cytokines and antioxidant enzymes in broiler chicks. A total of 300 birds of two strains (150 Ross strain vs. 150 Cobb strain) aged 3-d old were allotted into two stocking densities (standard stocking density,$0.046m^2/bird$ vs. high stocking density, $0.023m^2/bird$) in battery cages by $2{\times}2$ factorial designs with ten replicates until 35 d of age. There was no significant strain effect on body weight, feed intakes and feed to gain ratio and the relative organ weights. However body weight, feed intakes and relative organ weight were found to be significantly (P<0.05) affected by the effect of stocking density. Plasma corticosterone level was not affected by both stocking density and strain effects. Hepatic mRNA expression of pro-inflammatory cytokines including interleukin-$1{\beta}$ (IL-$1{\beta}$), IL-6, IL-18 and interferon-gamma (IFN-${\gamma}$) was not significantly changed by the effects of strain and stocking density. However, the mRNA expression of glutathione peroxidase (GPX) was affected by strain, showing that Ross strain decreased (P<0.05) the GPX expression. With respect to the effect of stocking density, there was a significant (P<0.05) increase in superoxide dismutase (SOD) and catalase (CAT) and GPX mRNA expression in the liver from high stocking density group. Splenic pro-inflammatory cytokine expression was not also affected by stocking density and strain, except that IL-18 mRNA significantly (P<0.05) decreased in Cobb strain under high stocking density. The mRNA expression of SOD and CAT was significantly (P<0.05) affected by the effects of stocking density and strain. In conclusion, growth performance was not affected by strain but stocking density. Although mRNA expression of major pro-inflammatory cytokines was not changed by stocking density and strain, antioxidant enzyme was significantly affected by stocking density, strain or even organ in birds under summer conditions. More detailed studies still needed to be explored to elucidate the effects of environmental conditions and genetic background on physiological responses in birds.

본 실험은 육계 품종(Ross vs. Cobb) 및 사육 밀도(표준 밀도구, $0.046m^2$/수 vs. 고밀도구, $0.023m^2$/수)가 생산성, 장기무게, 혈액 corticosterone, 친염증 사이토카인과 항산화 효소의 mRNA 발현에 미치는 영향을 조사하기 위해 실시하였다. 전체 사육 기간 동안 품종에 따른 생산성 지표들은 차이가 없었으나, 사육 밀도에 따른 사양 성적은 두 품종 모두 고밀도 사육구(HD)에서 표준 밀도구(SD)에 비해 체중과 사료 섭취량이 유의적으로 감소하였다(P<0.05). 간과 비장의 상대적 무게는 품종에 따른 유의적 차이가 나타났으나(P<0.05), 사육 밀도에 따른 차이는 없었다. 혈액 corticosterone 농도는 품종 및 사육 밀도에 따른 통계적 차이는 없는 것으로 나타났다. 육계 품종 및 사육 밀도에 따른 친염증 사이토카인과 항산화 효소의 mRNA 발현 양상으로 간 조직에서 이들 사이토카인(IL-$1{\beta}$, IL-6, IL-18 및 IFN-${\gamma}$) mRNA 발현은 품종과 사육 밀도에 따른 차이가 없었다. 한편, 항산화 유전자인 GPX mRNA 발현은 품종에 따라 현저한 반응의 차이를 보였으며(P<0.05), Ross 품종이 Cobb 품종보다 GPX mRNA 발현이 낮았다. 사육 밀도 요인에 따른 차이를 보면, SOD, GPX 및 CAT의 mRNA 발현이 모두 고밀도 사육구에서 현저히 증가되는 것으로 나타났다(P<0.05). 비장조직에서 대부분의 친염증 사이토카인은 품종 및 사육 밀도에 따른 차이가 없었으나, IL-18 mRNA 발현은 고밀도 사육 시 Cobb 종에서 발현이 감소되었다(P<0.05). 항산화 효소 mRNA 발현은 품종 및 사육 밀도 요인에 따라 SOD와 CAT에서 유의적 차이가 있었다(P<0.05). 이와 같은 결과로 보아 사양 성적은 육계 품종에 따른 요인에 영향을 받지 않았지만, 사육 밀도는 생산성을 감소시켰다. 친염증 사이토카인의 mRNA 발현은 품종 및 사육 밀도에 따른 차이는 적었으나, 항산화 효소는 품종, 사육 밀도 및 장기조직에 따른 발현의 차이가 나타나 체내 항상성 조절에 중요한 지표로서 지속적인 연구가 요구된다.

Keywords

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