<紀要論文>
Formation of Spontaneously Developing Pocks Regulated by Two Unhomologous Plasmids in Streptomyces Zaurentii

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概要 This study was conducted to determine the effect of the deletion of Ca or trace elements from semi-purified diets on growth and body composition of the yellow croaker Nibeaalbiflora. Fish with mean av...erage weight 28.8±2.5 g were fed on test diets with (control group) and without supplement of Ca or trace elements for 14 weeks at 20.0-22.5℃. No significant difference m-as observed in the growth of fish groups fed on diets deficient with Ca or trace elements and the control group. No apparent effect of feeding diets without Ca or trace elements was detected in hematological characteristics in all test groups. However, serum contents of Ca and inorganic P were higher in fish group received Ca deficient diet c:omparrd to the control. Bone contents of Mn, Cu and Zn decreased distinctly in fish group fed deficient trace elements diet. No obvious effect on the mineral contents of liver was seen in fish from all test, groups. It appears from these findings that, For growth performance, yellow croaker can met their requirements of Ca or trace elements by direct, assimilation of these minerals from the surrounding water but for ideal bone mineralization the addition of trace elements in diet seems to be necessary.続きを見る

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登録日 2012.08.01
更新日 2021.02.05

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