ウナギの肝臓酵素活性に及ぼす飼料への摂餌促進物質の添加効果

概要

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The effects of a feeding stimulant mixture contalning L-alanine, glycine, L-histidine, L-proline and 5-UMP as a dietary flavor were investigated on the activities of some hepatic enzymes relating amino acid and carbohydrate metabolisms of eel after 3 and 6h feeding on the final day of the experimental period of 25 days. At the same time the concentration of their plasma constituents were assayed. Plasma amino acid nitrogen in the test group fed on a flavored feed was maintained at a relalively lower level than that of the control group on an unflavoured feed. Alanine aminotransferase and aspartate aminotransferase were at higher levels in the liver of the test group. Blood glucose level in the control group showed a marked increase, while it remained constant in the test group. There was a trend of increasing activities in hepatic phosphoglucose isomerase, glucose-6-phosphate dehydrogenase and phosphogluconate dehydrogenase in the test group over the control group. These results suggest that the greater performance of the test group evidenced in the previous paper was indirectly attributable to the increased activities of the hepatic enzyme concerning cazbohydrate and amino acid metabolism.
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