Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Effects of extreme heat stress and continuous lighting on growth performance and blood lipid in broiler chickens

연속조명과 폭염 스트레스가 육계의 혈액지질 및 성장능력에 미치는 영향

  • Park, Sang-Oh (Department of Animal Biotechnology, Kangwon National University) ;
  • Hwangbo, Jong (National Institute of Animal Science, RDA) ;
  • Ryu, Chae-Min (Department of Animal Biotechnology, Kangwon National University) ;
  • Yoon, Jae-Sung (Department of Animal Biotechnology, Kangwon National University) ;
  • Park, Byung-Sung (Department of Animal Biotechnology, Kangwon National University) ;
  • Kang, Hwan-Ku (National Institute of Animal Science, RDA) ;
  • Seo, Ok-Suk (National Institute of Animal Science, RDA) ;
  • Chae, Hyun-Seok (National Institute of Animal Science, RDA) ;
  • Choi, Hee-Chul (National Institute of Animal Science, RDA) ;
  • Choi, Yang-Ho (Department of Animal Science, Gyeongsang National University)
  • Received : 2013.02.17
  • Accepted : 2013.03.23
  • Published : 2013.03.30
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Abstract

In this study, the effect of extreme heat diet on growth performance, lymphoid organ, blood immunoglobulin and cecum microflora change in broilers exposed to continuous lighting and extreme heat stress (EHS) was studied. Broilers raised under normal environment temperature ($25^{\circ}C$ or extreme heat stress temperature ($33{\pm}2^{\circ}C$, and consumed chow diet (CD) or extreme heat stress diet (EHSD). Five hundred Ross 308 day-old commercial broilers were arranged in a completely randomized block design of 5 treatment groups with 4 repetitions (25 heads per repetition pen). The broilers were divided into: T1 (normal environment+CD), T2 (EHS+CD), T3 (EHS+EHSD in which the tallow in CD was substituted by soy oil and contained 5% molasses), T4 (EHS+EHSD in which the tallow in CD was substituted by soy oil and contained 5% molasses, and 1.5 times more methionine and lysine than CD), and T5 (EHS+EHSD in which the tallow in CD was substituted by soy oil, contained 5% molasses, 1.5 times more methionine and lysine than CD, and 300ppm of vitamin C). The EHS significantly reduced the body weight gain and feed intake. The blood immunoglobulin, bursa of Fabricius, thymus, and spleen weight were significantly reduced when broilers were exposed to EHS. Compared to the normal environment temperature group, the cecum Lactobacillus sp. was low in the EHS treatment group, while Escherichia sp., Salmonella sp. and total aerobic bacteria in the EHS treatment group were high. A statistically significant difference was acknowledged between the treatment groups.

본 연구는 연속조명과 함께 폭염 스트레스(extreme heat stress, EHS)에 노출된 브로일러에서 폭염사료 급여가 혈액지질, 성장능력, 면역기관, 혈청 면역물질, 맹장 미생물 변화에 미치는 영향을 조사하였다. 일반 환경온도 ($25^{\circ}C$) 또는 폭염스트레스 ($33{\pm}2^{\circ}C$)하에서 사육한 병아리는 일반사료(chow diet, CD)와 폭염사료(extreme heat diet, EHD)를 섭취하였다. 부화 당일 Ross 308 병아리 500 마리를 5 처리구 4 반복(반복 펜 당 25 마리)으로 완전임의배치 하였다. T1 (일반환경+CD), T2 (EHS+CD), T3 (EHS+CD 내 우지를 대두유로 대체 및 당밀 5%를 함유하는 EHD), T4 (EHS+CD 내 우지를 대두유로 대체, 당밀 5%, 메치오닌과 라이신을 각각 CD 의 1.5 배씩 함유하는 EHD), T5 (폭염+CD 내 우지를 대두유로 대체, 당밀 5%, 메치오닌과 라이신을 각각 CD 의 1.5 배씩 추가 및 비타민 C 300 ppm 을 함유하는 EHD)로 구분하였다. EHS 는 체중 및 사료섭취량을 유의하게 감소하였다. 혈액지질, 혈액 면역물질, F 낭, 흉선 그리고 비장의 무게는 브로일러를 EHS 에 노출하였을 때 유의하게 낮아졌다. 일반 환경온도 처리군과 비교할 때 EHS 처리군에서 맹장 Lactobacillus sp.는 낮았으나 Escherichia sp., Salmonella sp. 및 총호기성균은 높게 나타났으며 각 처리구 사이의 통계적인 유의차가 인정되었다.

Keywords

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