Lactate dehydrogenase as a possible indicator of reproductive capacity of boars

The aim of this study was to determine the activity of lactate dehydrogenase (LDH) and its isoenzymes in the blood serum and seminal plasma of boars from the breeding and insemination centre with regard to their age. Significant quantitative differences in the presence of isoenzymes between blood serum and seminal plasma were recorded. Isoenzyme LDH-C4 in the seminal plasma of breeding boars of both groups was identified in the position between the third and fourth fraction of LDH, although boars from the breeding centre showed significantly lower concentrations. Refrigeration had a negative influence on the activity of LDH isoenzymes in the blood serum after 7 days and in seminal plasma after 3 days of storage. The work extends the knowledge in an insufficiently examined field of veterinary medicine: the distribution and physiological function of LDH in boars focusing on isoenzyme LDH-C4 in seminal plasma.