Alkaline and acid phosphatase activity, pH and osmotic pressure of boar semen.

Alkaline phosphatase activity was recorded in forty ejaculates of the sperm rich fraction of boar semen as 9,790 +/- 5,250 Klein-Babson-Read units per 100 ml. of seminal plasma. Acid phosphatase activity in the same ejaculates was 681 +/- 304 Babson-Read units per 100 ml. of seminal plasma. No alkaline phosphatase activity was detected in the seminal plasma of vasectomized boars. The pH of the sperm rich fractions was 7.69 +/- 0.33 and the osmotic pressure was 313.56 +/- 7.98 milliosmols.