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Influence of body zinc content on the reaction of various parameters of zinc metabolism 2. apparent absorption urinary excretion and body retention of zinc

Influence of body zinc content on the reaction of various parameters of zinc metabolism 2. apparent absorption urinary excretion and body retention of zinc

Zeitschrift fuer Tierphysiologie Tierernaehrung und Futtermittelkunde 51(1-2): 98-106

In balance trials with 2 groups of 36 each male rats of similar weight (25 .+-. 8 and 119 .+-. 6 g, respectively) the effect of body Zn stores on apparent absorption, urinary excretion and body retention of Zn at different dietary Zn levels (2.8, 5.4, 8.3, 10.4, 15.3 and 18.7 mg/kg d.m. [dry matter] respectively) was measured. The body Zn content of both groups differed significantly (P < 0.001) at the beginning of the experiment by 19% (2314 vs. 2856 .mu.g), the body Zn concentration by 22% (20.7 vs. 26.4 .mu.g/g body mass; P < 0.001). Apparent absorption was not influenced by body Zn stores. Animals with lowered stores excreted significantly (P < 0.001) less Zn in urine than their counterparts with higher stores. Due to the reduced urinary excretion animals with lowered Zn stores utilized the dietary Zn more efficiently (P < 0.05-0.001), without being sufficient to compensate the deficit in body Zn. Assuming that a value of 24 .mu.g Zn/g of body mass is reflecting an optimal Zn supply, the Zn requirement of the animals with normal Zn stores can be estimated to be 12-13 mg/kg, that of the animals with lowered stores at least 19 mg/kg d.m. Apparently, the Zn metabolism and Zn requirement of the growing rat is influenced by the body Zn stores.

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