40 individuals of the wild duck and its domesticated species were examined in all. The main purpose of this work was to analyze weight and linear parameters of heart. The results were statistically worked out by using the two-factor variance analysis from the cross classification where more than one observation in each sub-class was made. The dependence between features was defined by taking into consideration simple correlation coefficients with the significance level α=0,05. The relative heart weight was also calculated. It was proved that the wild duck’s heart, being smaller and lighter in its absolute weight, is relatively larger than that of the domestic duck, which may be evidence of a higher physiological efficiency.

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