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Effect of Raising Periods on Amino Acids and Fatty Acids Properties of Chicken Meat

사육일령이 육계의 가슴 및 다리살의 아미노산·지방산 변화에 미치는 영향

  • 채현석 (농촌진흥청 국립축산과학원) ;
  • 최희철 (농촌진흥청 국립축산과학원) ;
  • 나재천 (농촌진흥청 국립축산과학원) ;
  • 김민지 (농촌진흥청 국립축산과학원) ;
  • 강환구 (농촌진흥청 국립축산과학원) ;
  • 김동욱 (농촌진흥청 국립축산과학원) ;
  • 김지혁 (농촌진흥청 국립축산과학원) ;
  • 조수현 (농촌진흥청 국립축산과학원) ;
  • 강근호 (농촌진흥청 국립축산과학원) ;
  • 서옥석 (농촌진흥청 국립축산과학원)
  • Received : 2012.01.03
  • Accepted : 2012.04.05
  • Published : 2012.06.30

Abstract

This study was to investigate the amino acid, free amino acid and fatty acid composition of chicken breast muscle and legs muscle by different raising periods (30, 36 and 42 days). In amino acid composition, the glutamic acids were 3.63% at 30 days, 3.63% at 36 days and 3.54% at 42 days in the breast muscle. The glutamic acid contents in the breast and leg muscle were decreasing tendency as raising periods increased. The total free amino acids were 370.6 mg at 30 days, 235.9 mg at 36 days and 246.3 mg at 42 days in the breast muscle, and those were 470.16 at 30 days, 326.4 mg at 36 days and 321.9 mg at 42 days in the leg muscle. Total contents of free amino acids were higher in chicken legs muscle than in chicken breast muscle. The linoleic acids, the most essential fatty acid, were contained 17.84% at 30 days, 17.84% at 36 days and 20.33% at 42 days in chicken breast muscle. These results indicated that the fatty acid composition increased as raising periods increased. There were 0.69% DHA (Docosahexaenoic acid) in chicken breast muscle at 30 days, 0.96% at 36 days and 1.29% at 42 days. From these results, the DHA contents in chickens were also increased as raising periods increased.

본 연구는 1일령 초생추(Ross)를 부화장에서 암 수 분리한 후 구입하여, 수병아리만 평당 66수를 수용해 왕겨 깔짚을 사용한 평사에서 사육을 시작하여 사육일령이 30, 36, 42일령 일 때 임의로 선발하여 도계한 다음 닭고기의 가슴 및 다리육의 아미노산, 유리아미노산, 지방산 변화를 구명하기 위하여 수행하였다. 육계의 사육일령별 닭고기의 육질변화에서 아미노산 중 glutamic acid의 변화는 가슴살에서 사육일령이 경과할수록 감소하는 경향을 나타내었고, 다리육에서도 가슴육과 유사한 경향을 나타내었다. 총 유리아미노산 변화에서는 가슴살에서 246.3~370.6 mg%를 나타내었고, 다리육은 321.9~470.16 mg%를 나타내어 가슴살보다 다리육에서 전반적으로 더 높은 값을 나타내었다. 유리아미노산에서 glutamic acid도 다른 유리아미노산과 비슷하게 사육 기간이 경과할수록 감소하는 경향을 나타내었다. 지방산 변화는 가슴살에서 필수지방산 중 가장 많은 부분을 차지하는 linoleic acid 함량은 사육일령이 경과할수록 증가하는 경향을 나타내었으며, 뇌세포의 주성분인 DHA의 성분도 가슴육의 경우 30일령보다 42일령에서 1.9배 정도 증가하였다. 이러한 경향은 다리육에서도 유사하게 나타내었다. 가슴육 및 다리육의 총 불포화지방산 비율도 육계의 사육일령이 경과할수록 증가하는 경향을 나타내었다.

Keywords

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