マダイ卵の化学組成に及ぼす飼料のタンパク質含量および産卵前給餌期間の影響

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  • Nutritional studies in the seed production of fish - XVIII. Effect of dietary protein levels and feeding period before spawning on chemical components of eggs produced by Red Sea bream broodstock.
  • マダイ卵の化学組成に及ぼす飼料のタンパク質含量および産卵前給餌期間の影響〔英文〕
  • マダイ ラン ノ カガク ソセイ ニ オヨボス シリョウ ノ タンパクシツ ガ

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Both buoyant (normal eggs floating on water surface) and deposited (abnormal eggs that sink to the bottom of tanks) eggs produced by broodstock of different dietary histories were analysed for lipid class, fatty acids, vitamins A and E, cholesterol, minerals, and proximate composition. The dietary treatments were diets containing different levels of protein which were fed for 6 months, or broodstock fed diet supplemented with pigments and fat-soluble vitamins or frozen raw krill shortly before spawning.<br>There were no marked differences in proximate and mineral composition due to the different broodstock diets, although the concentration of protein in the buoyant eggs was proportional to dietary protein levels used, while moisture content varied inversely. The fatty acids in eggs were greatly affected by dietary fatty acids supplied to broodstock either shortly before their spawning or even during spawning. In the eggs from the broodstock fed on corn oil diet immediately, and prior to spawning, the percentage of 18:2ω6 was as high as 26% in comparison with the original value. Vitamin E was also found to be easily incorporated in the eggs together with lipids via the diet. The level of cholesterol in eggs was almost constant irrespective of the cholesterol levels in the diets.<br>Thus no marked differences that might related to egg quality were observed in chemical components in either buoyant or deposited eggs among the experimental groups, although significant differences occurred between the buoyant and deposited eggs.

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  • 日本水産学会誌

    日本水産学会誌 51 (9), 1501-1509, 1985

    公益社団法人 日本水産学会

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