Abstract
Changes of growth and serum proteins were found in ducklings nourished with commercial diet enriched with cobalt. It was found that a high concentration of this element in diet involves a significant diminution of growth, an increase of β-globulins and a decrease of albumin. It was observed too that the diminution of concentration of cobalt in diet involves after- wards a catch-up of growth and the normalisation of serum proteins. The hypothesis of possible detoxication-mechanism is discussed in this paper.

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