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Effects of dietary vitamin B6 levels on lipid concentration and fatty acid composition in growing chicks |
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B. K. An, K. Tanaka, S. Ohtani |
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| Abstract |
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This experiment was designed to evaluate the effect of various dietary vitamin B6 levels on conversion from linoleic acid to arachidonic acid in various tissues in growing chicks. Growing chicks were fed the prified diet containing 7% safflower oil with defferent levels of vitamin B6(0, 4, 8, 40, 80 mg per kg diet) for 14 days. Feed intake and weight gain in chicks fed the vitamin B6-free diet were markedly depressed. Esterified and free cholesterol concentrations in serum were significantly higher, while the serum triglyceride concentration was significantly lover in chicks fed the vitamin B6-free diet compared to that fed diets with vitamin B6. The liver triglyceride content was also lower in chicks fed the vitamin B6-free diet. The liver and serum cholesterol ester fractions in chicks fed the vitamin B6-free diet showed higher rate of C18:2n6 and lower rates of C18:3n6, C20:3n6 and C20:4n6 as compared with vitamin B6 fed groups. In serum phospholipids fraction of chicks fed the vitamin B6-free diet, rates of C20:3n6 and C20:4n6 were markedly lower. As dietary vitamin B6 level was increased, the rate of C20:4n6 was slightly increased, although it was statistically not significant. The fatty acid compositions of adipose tissue showed almost the same pattern as those in liver and serum. This result suggests that the desaturation of C18:2n6 to C18:3n6, elongation to C20:3n6 or both steps might be impaired by vitamin B6 deficiency in growing chicks. |
| Keywords:
Dietary Vitamin B6 Level; Concentration; Fatty Acid Composition; Growing Chicks |
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