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닭의 지방대사와 지방간

Lipid Metabolism and Fatty Liver in Poultry

  • 문양수 (경남과학기술대학교 동물생명과학과)
  • Moon, Yang Soo (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
  • 투고 : 2018.05.14
  • 심사 : 2018.06.20
  • 발행 : 2018.06.30

초록

현대양계산업은 육종, 영양, 관리기술의 향상에 힘입어 산란계의 생산성과 육계의 성장성이 크게 향상되었다. 이러한 닭의 생산성 향상을 뒷받침해 주기 위해서는 이들의 대사적 요구를 충족시킬 수 있는 건강한 간의 기능이 필요하다. 가금에서 지방산의 대부분은 간에서 생합성되며, 이는 간의 지방대사가 닭의 생육 및 산란능력 등에 매우 중요하다는 것을 의미한다. 간에서의 지방합성이 지방의 대사능력과 분비를 초과하게 되면 중성지방은 간에 축적되어 지방간(fatty liver)을 유발하기도 한다. 산란계의 경우 산란을 시작하게 되면 혈액 내 유리지방산, 지질 및 인지질 등이 급격히 증가한다. 산란계에서 산란율이 높은 닭은 난황합성이 활발하게 일어나기 때문에 지방간을 가지는 경우가 많으며, 심한 경우 간의 손상(liver-hemorrhage)에 의해 폐사로 이어질 수 있다. 따라서 닭의 간에서 지방합성과 합성된 지방의 분비와 이용은 건강한 닭의 성장과 생산성 향상에 주요한 열쇠로 판단되어 최근까지 연구된 닭의 지방대사와 지방간 억제 혹은 예방 등에 대하여 기술하였다.

A great progress in genetic selection, nutrition and management practices has contributed to the improved growth rate of broilers and egg production in laying hens. For the increased productivity of modern poultry, a healthy chicken liver needs to cope with the increased metabolic demands. The liver is the major site of de novo fatty acid synthesis; therefore, hepatic lipogenesis is crucial for producing better quality meat and eggs. When de novo lipogenesis exceeds the capacity of lipid metabolism and secretion, large amounts of lipids accumulate in the liver of broilers, leading to a fatty liver. Upon onset of egg-laying in hens, lipids including free fatty acids, triglycerides, and phospholipids are dramatically increased in blood plasma for the synthesis of yolk precursors in oocytes. Productive hens with fatty liver often have hemorrhagic syndrome and sudden death due to the heavy demands of yolk synthesis, which burdens the liver. Understanding the lipid metabolism and hepatic lipid disorders is a key point in the improvement of the growth and production of chickens. This review focuses on the recent studies on lipid metabolism, the hepatic lipid disorders, and the prevention or reduction of fatty liver in poultry.

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참고문헌

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