Abstract
The purpose of this study was to clarify the influence of iron on zinc status. The animals were divided into four groups, consisting of five rats in each group. The control group was fed on basal diet with adequate levels of zinc and iron, whereas the experimental group was fed diets containing different levels of iron ad libitum for 15 d. Low levels of iron (LFe) significantly increased the zinc absorption percentage but there was a decrease in high (HFe) and very high iron (VHFe) level groups (p < 0.001). The retention percentage changes were found to be parallel to the changes in the absorption percentage curve. It was found that zinc (per total dry tissue) and Zn-65 (per total tissue) increased in the rats fed the LFe, whereas in general they decreased in the rats fed the HFe and VHFe diets. Significant changes were found in the duodenum and liver. Zn-65 (per g wet tissue) significantly increased in the brain and liver in the LFe group, but there was a decrease in the duodenum, ileum, kidney, liver, and brain in the HFe and VHFe groups. Changes in the level of zinc (per g dried tissue) were found to be parallel to the changes in Zn-65 in all the groups. The dietary proportions of iron appear to influence zinc metabolism at the intestinal and cellular transport levels over a given period of time.
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