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Influence of cage type and dietary zinc oxide upon molybdenum toxicity

G L BRINKMAN, R F MILLER

    Science (New York, N.Y.)
    |November 10, 1961
    PubMed

    Insights

    Zinc from galvanized cages, not molybdenum, caused weight loss and low hemoglobin in rats. Chewing on zinc-coated cages led to these health issues, impacting molybdenum-fed animals.

    Area of Science:

    • Animal Nutrition
    • Toxicology
    • Mineral Metabolism

    Background:

    • Molybdenum is an essential trace element for animal health.
    • Galvanized cages contain zinc, which can leach into animal diets.
    • Rodent housing materials can influence experimental outcomes.

    Purpose of the Study:

    • To investigate the cause of reduced weight gain and hemoglobin levels in molybdenum-fed rats housed in galvanized cages.
    • To differentiate the effects of molybdenum from potential contaminants in housing materials.

    Main Methods:

    • Rats were fed molybdenum and housed in either galvanized or stainless steel cages.
    • Dietary zinc levels were manipulated in rats housed in stainless steel cages.
    • Weight gain and hemoglobin levels were monitored.

    Main Results:

    • Rats in galvanized cages showed reduced weight gain and lower hemoglobin compared to those in stainless steel cages.
    • Increasing dietary zinc in stainless steel cage conditions mimicked the negative effects observed in galvanized cages.
    • These findings suggest zinc exposure was the primary factor.

    Conclusions:

    • Zinc leached from galvanized cages, not molybdenum deficiency, caused the observed adverse effects.
    • Accidental zinc toxicosis from cage materials can confound nutritional studies in rodents.
    • Careful selection of housing materials is crucial for reliable animal research.
    Keywords:
    MOLYBDENUM/toxicologyZINC/nutrition and diet

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