Dietary cellulose, zinc and copper: Effects on tissue levels of trace minerals in the rat
1979
Tsai, R.C.Y. | Lei, K.Y.
To examine the effect of graded levels of cellulose, zinc and copper on tissue mineral levels, the levels were assayed by atomic absorption spectrophotometry in samples collected from a study involving 12 treatments in a 3 x 2 x 2 factorial arrangement. Groups of 6 weanling male rats were fed three levels of cellulose, two levels of copper (Cu), and two levels of zinc (Zn). Reductions of tissue Cu content were observed in the serum, liver, tibia and testis of rats fed the Cu-deficient diets. The iron (Fe) content of the tibia and testis was reduced, but that of liver was elevated in rats fed Cu-deficient diets. Reductions in tibial Zn levels were observed in rats fed marginal-Zn as compared to those fed abundant-Zn diets; and in rats fed Cu adequate as compared to those fed Cu-deficient diets. Increases in cellulose resulted in increased liver and testicular Cu content only in rats fed the Cu-deficient diets. Additions of cellulose appeared to have no adverse effect on the distribution of Zn, Cu and Fe in tissues sensitive to dietary deficiencies. Except for the Cu-deficient, marginal-Zn diets, serum zinc values decreased as cellulose was increased.
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