[Activity and isoenzyme pattern of alkaline and acid phosphatases in bull seminal plasma].

Investigations are carried out on the activity and isozyme pattern of the alkaline and acid phosphatases in bull's seminal plasma. To determine the activity of the two phosphatases, two different colorimetric methods are used. The electrophoretic separation of the isozymes of the acid and alkaline phosphatases is performed on polyacrylamide and starch gels.

[Fructose and the fructolysis index in bull semen].

The fructose content and the fructolysis index were studied in the semen of bulls. It was established that the value of the index depends upon the age. Highest values were found with the semen of 2-year-old bulls (3.

[Chloride levels in the estral secretion and the fertility of cows].

Studied was the chloride content of the estral secretion of cows at their insemination. It was found that chlorides vary from 351 to 1130 mg% on an average. In 90 per cent of the cows the chloride content varied within the 701-1200 mg% range.