Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Effect of Dietary Betaine and Energy Levels on Liver Fats and Cholesterol in Laying Hens

사료내 비태인과 에너지 수준이 산란계의 간지방과 콜레스테롤에 미치는 영향

  • Park J. H. (Department of Animal Resources and Biotechnology, Chonbuk National University) ;
  • Park S. Y. (Department of Animal Resources and Biotechnology, Chonbuk National University) ;
  • Ryu K. S. (Department of Animal Resources and Biotechnology, Chonbuk National University)
  • 박재홍 (전북대학교 동물자원과학과) ;
  • 박수영 (전북대학교 동물자원과학과) ;
  • 류경선 (전북대학교 동물자원과학과)
  • Published : 2005.09.01
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Abstract

Two experiments were conducted to examine the effects of betaine intake on blood and yolk cholesterol, abdominal fat, liver fat, tissue triglyceride(TG) and liver HMG-CoA reductase In laying hens. In Expt. 1, a total of 72 ISA-brown laying hens were individually assigned into four treatments from 18 to 21 weeks old. Com-soybean meal based diet were fed with the addition of 0, 300, 600 and 1,200ppm. In Expt. 2, 72 ISA-brown laying hens were housed into individual cage to evaluate the effect of dietary betaine(0, 600ppm) and energy(ME, 2,800, 2,900kca/kg) from 70 to 74 weeks. Serum total cholesterol, LDL and HDL-cholesterol and TG concentration in blood of hens fed betaine tended to increase compared to those of the control, but were not significantly different. However, betaine supplementation showed a statistically significant decrease in yolk cholesterol(P<0.05). There was no significant difference in abdominal fat among the treatments. Liver fats and 7c of birds 130 betaine was decreased compared with control. Serum total cholesterol, LDL-cholesterol and triglyceride concentration were significantly inc.eased by ffeding a diet containing 600ppm betaine in Expt. 2(P<0.05), but were not influenced by the dietary energy levels. Yolk cholesterol, abdominal fat and HMG-CoA reductase activity were affected neither by dietary energy nor betaine level.

비태인의 급여가 산란계의 지질 대사에 미치는 영향을 구명하기 위하여 혈액의 성상, 복강지방과 간 지방 함량, 난황의 콜레스테롤 함량, 조직내 중성 지방 함량 그리고 간 조직의 HMG-CoA reductase activity를 조사하기 위하여 2차례의 사양시험을 실시하였다. 시험 1에서는 18주령 ISA-Brown 산란계를 이용하여 처리구당 18수씩 총 72수를 공시하여 4주간 사양시험을 실시하였다. 처리구는 CP $16\%$, ME 2,800kcal/kg의 기초사료에 비태인 0, 300, 600, 1,200ppm 수준으로 첨가$\cdot$급여하였다. 시험 2에서는 70주령 ISA-Brown 산란계를 공시하여 처리구당 18수씩 총 72수를 공시하여 4주간 사양시험을 실시하였다 처리구는 사료내 에너지 2수준(2,800, 2,900kcal/kg)과 비태인 2수준(0, 600ppm)으로 $2\times2$ 요인분석 시험을 실시하였다. 본 시험의 결과, 난황의 콜레스테롤 함량에서는 비태인 600, 1,200ppm 첨가구가 대조구와 비태인 300ppm 첨가구에 비하여 유의하게 감소하였다(P<0.05). 혈중 total cholesterol, LDL-cholesterol 그리고 중성지방 함량은 비태인의 첨가 수준에 따라서 그 수치도 증가하는 경향을 보였으나 유의적인 차이는 없었다(시험 1). 에너지 수준(2,800kcal/kg, 2,900kcal/kg)에 따른 비태인의 첨가 효과를 조사한 결과, 혈중 total cholesterol, LDL 및 중성 지방 함량은 에너지 수준에서는 차이가 없었으나 비태인 600ppm 첨가구는 무첨가구에 비하여 현저하게 증가하였다(P<0.05). 그러나 난황 콜레스테롤 함량에서는 사료내 에너지와 비태인 수준에 영향을 받지 않았다(시험 2).총2회의 시험에서 생체중에 대한 복강지방의 비율$(\%)$은 일관적인 결과를 나타내지 못하였으며, 간의 총지질 함량은 비태인의 급여 수준이 증가할수록 감소하여 비태인 1,200ppm 급여구에서는 대조구와 비교하여 유의적인 차이를 나타내었다. 또한 간의 중성 지방 함량에 있어서도 비태인 급여구에서 유의하게 감소하였다(P<0.05). 한편,간 조직의 HMG-CoA환원 효소의 활성에 있어서는 처리구간 유의적인 차이가 없었다.

Keywords

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