Effects of high dose supplementation of ascorbic acid on chicks.
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概要
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The effects of high doses of ascorbic acid (AA) on growing chicks were investigated in two experiments. Broiler and White Leghorn day-old male chicks were fed a basal diet (control) and a AA supplemented diet, which was supplemented with AA at varying levels to the basal diet, for three or four weeks.1) The supplementation of AA, even at levels as high as 3%, had no appreciable effects on body weight gain, feed intake and feed efficiency. In addition, no significant differences in liver, kidney, pancreas, spleen, testis, adrenal and thyroid weights among dietary treatments were observed, though both adrenal and thyroid weights of the chicks receiving supplemental AA tended to be slightly heavier compared to those of control chicks.2) Blood (whole blood or blood plasma) AA level was significantly influenced by AA supplementation and that level was 1.3 to 2.6 times higher than that of controls and was shown to elevate in proportion to the increase of supplemental AA in the diet.3) Liver and adrenal AA levels in chicks fed the AA supplemented diet were 1.5 to 1.8 times and 1.2 to 1.3 times higher than those in control chicks, respectivery, and the former was a significant elevation but the latter was not. When the chicks were fed the diet which was supplemented with AA at a level of 1.5% or above, their lever and adrenal AA levels were both almost the same.4) Neither the activities of transaminases (GOT and GPT) and alkaline phosphatase nor the levels of calcium and total cholesterol in blood serum were significantly affected by the supplementation of AA.5) Results obtained suggest that high doses of AA, even at levels as high as 3.0%, have no adverse effects on growing chicks.
- 日本家禽学会の論文
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