EN
Evaluation of the ram semen quality on the basis of some quantitative and qualitative indicators does not provide full information about the male’s usefulness for reproduction. This explains why studies on the use of biochemical indicators for determinating the biological quality of semen have been performed for many years. Measuring the concentration of some compounds (fructose, citric acid, seminal plasma proteins) in semen plasma enables the secretory activity of the accessory glands to be evaluated. Comtemporary biochemical studies are mainly focused on determining the changes in the activity of plasma and spermatozoon enzymatic systems. Determinating the activity of the acrosine system (acrosine and its inhibitors), aspartic aminotransferase (AspAT) and alkaline phosphatase is particularly important.Evaluation of the ram semen quality on the basis of some quantitative and qualitative indicators does not provide full information about the male’s usefulness for reproduction. This explains why studies on the use of biochemical indicators for determinating the biological quality of semen have been performed for many years. Measuring the concentration of some compounds (fructose, citric acid, seminal plasma proteins) in semen plasma enables the secretory activity of the accessory glands to be evaluated. Comtemporary biochemical studies are mainly focused on determining the changes in the activity of plasma and spermatozoon enzymatic systems. Determinating the activity of the acrosine system (acrosine and its inhibitors), aspartic aminotransferase (AspAT) and alkaline phosphatase is particularly important.