A COMPARISON OF PHOSPHOMONOESTERASE ACTIVITIES IN THE SEMINAL PLASMAS OF THE DOMESTIC COCK, TURKEY TOM, BOAR, BULL, BUCK RABBIT AND OF MAN

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Abstract
A comparison of the phosphomonoesterase activity, against 4-nitrophenyl phosphate, in the seminal plasma of the domestic cock, turkey torn, boar, bull, buck rabbit and of man has been made. The acid-phosphatase(s) activity at pH 4.9 was highest in man, the cock and turkey torn, and lowest in the boar and rabbit, with the bull intermediate. Alkaline-phosphatase activity was highest in the boar and rabbit, lowest in the cock, turkey torn and in man, with the bull again intermediate. It is possible that much of the alkaline phosphatase in the boar semen was derived from the epididymis or testis or both. Unlike that of the mammals, the acid phosphatase(s) of cock seminal plasma was unable to hydrolyse choline-O-phosphate and the enzyme(s) activity in seminal plasma was only slightly, if at all, inhibited by dextrorotatory tartrate. The significance of these findings has been briefly discussed.

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