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Effects of Wheat Bran on the Metabolism of Calcium-45 and Zinc-65 in Rats

Station de Recherches de Nutrition, I.N.R.A. 78350 Jouy-en-Josas, France

Metabolic balances of orally administered tracer doses of ⁴⁵Ca and ⁶⁵Zn were carried out in 20 weanling male rats to examine the effect of different levels of wheat bran (0, 5, 10 and 15%) on the bioavailability of these minerals in diets containing respectively 9.32, 9.26, 9.28 and 10.76 mg/g of calcium and 58, 63, 68 and 76 ppm of zinc. To estimate the influence of adaptation to feed consumption, the experiment was repeated after a 10-day period of adaptation; a split-plot-in-time design was used for statistical analysis. The growth rate was not affected by bran administration. No significant change was found in ⁴⁵Ca or ⁶⁵Zn absorption due to the addition of wheat bran to the diets. The results in the two repetitions were the same.

KEY WORDS: • wheat bran • calcium-45 • zinc-65 • bioavailability • rat

Manuscript received 9 April 1982.