Copper, an element of great importance for organism, plays a key role in the regulation of metabolism mainly as a component of many enzymes. Deficiencies of this element can be a cause of many subclinic and/or clinic functional disorders. Ruminants are particularly susceptible to copper deficiencies. The purpose of this researches was to evaluate of the dynamics of changes in blood plasma copper concentration of kids in the first month of their life and to investigate how the effect of sex and litter size would affect the concentration of this element. The results suggest that blood plasma copper concentration in kids change most dynamically during the first 10 days after birth. It seems that sufficient efficiency of homoeostatic mechanisms regulating the concentration of this element in the blood is reached before the end of the second week of the postnatal life. Neither the sex of the kids nor the litter size influence copper concentration in blood plasma and the dynamics of its changes with age. Nevertheless, higher concentrations of this element have been observed in single-birth kids.

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