The blood from 23 breeding boars was taken to analyse of minerals in the blood plasma 4 times in the course of 5months. The mean Ca, P, Mg and Cu concentrations were 2.24mmol l⁻¹, 1.95mmol l⁻¹, 0.71 mmol l⁻¹ and 34.49 μmol l⁻¹, respectively; the Ca : P ratio was 1.18. During the entire experimental period the average sperm concentration, ejaculate volume and sperm motility of all the boars was 0.43 · 106 mm-3, 303.20 cm3 and 89.00%, respectively. The average total number of sperm (TNS) and the total number of motile sperm (TNMS) in the ejaculate was 130.49 · 109 and 116.12 · 109, respectively. A statistically highly significant negative correlation (P < 0.01) were detected between the concentration of P in the blood plasma and the ejaculate volume (rp = -0.40), TNS (rp = -0.34) and TNMS (rp = -0.33). There was significant positive correlation between the Ca:P ratio and the ejaculate volume rp = 0.28 (P < 0.01), TNS rp = 0.22 (P < 0.05) and TNMS rp = 0.22 and rp = 0.21 P < 0.05). The mean concentrations of Ca, P, Mg and Cu in the boar seminal plasma were 0.38 mmol l⁻¹, 1.22 mmol l⁻¹, 3.03 mmol l⁻¹ and 9.51 μmol l⁻¹, respectively; the Ca:P ratio was 0.34. The mostly negative correlations were detected between the sperm parameters and concentrations of Mg in the semen plasma – from rp= -0.52 (P < 0.05) to rp= 0.12. There is possible, to state that concentration of monitored minerals in blood and seminal plasma influence qualitative sperm parameters. Optimizing of their concentration and proportional ratio could lead to positive influencing of sperm qualitative parameters.
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