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Effects of High Dietary Molybdenum in Rabbits

To study the effects of high dietary molybdenum, rabbits were fed with commercial pellets and carrots containing 39 mg Mo/kg dry matter [Experiment 1] and with a commercial diet supplemented with 40 mg Mo/kg dry matter [Experiment 2] for 14 days. The high dietary Mo contents did not reduce the growth of rabbits. Supplemental Mo given in a dose of 40 mg/kg non-significantly decreased the apparent digestibility of crude protein and crude fibre compared to the control (73.63 +/- 2.49 and 18.56 +/- 5.10 vs. 74.31 +/- 3.03 and 21.38 +/- 6.48, respectively). Molybdenum ingested with feeds was mainly excreted (57%) via the urine. The highest Mo levels were found in kidney and liver samples (3.464 +/- 0.872; 5.27 +/- 0.95 mg/kg DM [Experiment 1] and 1.878 +/- 0.283; 1.62 +/- 0.16 mg/kg DM [Experiment 2], respectively), and Mo could also be detected in limb meat (0.336 +/- 0.205 mg/kg DM). The testes were more sensitive to Mo exposure than the female reproductive organs because the number of germ cells was reduced. Due to the high dietary Mo intake free radicals could be generated, resulting in a marked increase of creatine kinase activity.

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