• Title/Summary/Keyword: 난질

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Egg Quality and Amino Acid Composition of Fertilized Eggs of Red Spotted Grouper, Epinephelus akaara (사육환경에 따른 붉바리 Epinephelus akaara 수정란의 난질 및 아미노산 조성)

  • Jong-Youn, Park;Jae-Kwon, Cho;Kyeong-Ho, Han;Chang-Gi, Hong
    • Journal of Marine Life Science
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    • v.7 no.2
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    • pp.139-144
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    • 2022
  • This study aims to investigate egg quality changes and free amino acid composition. Factors that can affect egg quality about farming conditions were investigated through biochemical analysis of egg by red spotted grouper, Epinephelus akaara. As a result, the buoyant, fertilization embryonic survival and hatching rate were better when reared in sea cage than in tank. And the content of free amino acid in fertilized eggs reared in sea cage was higher then in tank. In conclusion, fertilized eggs with good egg quality can be produced when farming sea cage, and contained more free amino acid.

Changes of Albumen Index and Haugh Unit by the Different Position of Thick Albumen Height of Eggs Measured (계란 농후난백의 높이 측정부위에 따른 Albumen Index와 Haugh Unit의 변화)

  • 하정기;김태호;나재천;강보석;하광수;김동혁;이상진
    • Korean Journal of Poultry Science
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    • v.29 no.3
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    • pp.157-170
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    • 2002
  • This experiment was conducted to investigate the change of egg qualify by the height of thick albumen of egg, storage temperature and storage period. The albumen index and Haugh unit were measured and compared among five different storage periods(0, 2, 4, 6, and 10 days), four different storage temperatures($15^{\circ}C$ , $20^{\circ}C$ , $25^{\circ}C$ and $30^{\circ}C$ ), and five different Parts(0, 3, 6, 9, and 12 mm) aparted from egg yolk. The albumen index and Haugh unit were as follows: the albumen index of eggs was significantly(P<0.01) different by the storage temperature and by the measuring position of thick albumen of eggs. It means that the albumen index can be differed by the measuring position of thick albumen even if eggs have a same qualify. For measuring egg qualify in this country, it should be announced that which Parts in thick albumen of eggs are measured. The albumen index of fresh eggs was 0.16. However, the index when measured at 3 hour after oviposition was lower than 0.16. Therefore, it indicates that the criterion of 0.06 lower than 0.16 is required to set for considering practical point during the marketing periods of eggs. When the criterion of albumen index puts 0.06, it is as 100%. Therefore, eggs can be kept the same quality for 6, 4 and 2 days when eggs were stored at $15^{\circ}C$ , $20^{\circ}C$ and 25 ~$30^{\circ}C$ , respectively. When the criterion of Haugh unit score puts 79 as 100%, the eggs can be maintained the quality for 6, 4, and 2 days when eggs are stored at $15^{\circ}C$ , $20^{\circ}C$ and 25~$30^{\circ}C$ , respectively. When the criterion of Haugh unit 55 as 100%, the eggs can be maintained the same quality for 10, 8 and 2 days when eggs are stored at $15^{\circ}C$ , $20^{\circ}C$ and 25~$30^{\circ}C$ , respectively. From the experimental results, it can be considered that calculathing egg quality by the height of thick albumin of eggs which was measured at the attachment Parts of thick albumin layer and yolk of eggs was most reasonable and suitable when considering the marketing periods of eggs.

특집_양계산업 경쟁력 향상 방안 - 파란 방지를 위한 사양관리

  • Yu, Han-Jin
    • KOREAN POULTRY JOURNAL
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    • v.42 no.5
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    • pp.110-115
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    • 2010
  • 국민들의 소득수준이 높아지면서 계란을 선택할 때에도 가격이 다소 비싸더라도 품질을 믿을 수 있는 계란을 구매하는 비율이 높아지고 있으며, 실제로 기능성 계란 등 특수란의 매출이 늘고 있는 추세다. 일반란을 구매할 때에도 품질을 따지는 소비자가 늘어나면서 계란판매에 어려움을 겪지 않으려면 품질이 좋은 계란을 생산해야 한다. 계란의 난각과 난질은 물로 신선도가 떨어지면 소비자의 외면으로 상인들이 기피하게 될 것이다. 특히 난각이 나쁠 경우 난질을 좋게 유지하기가 어렵고, 소비자가 계란을 선택할 때 내용물을 확인할 수 없으므로 눈으로 외형을 보고 선택하게 된다. 난각을 좋게 하여 파란 및 등외란을 줄인다는 것은 농장의 경영이익을 높이는 매우 중요한 관리사항이다. 난각을 좋게 하는 방법과 파란 및 등외란을 줄이는 여러 방법을 살펴보고자 한다.