[Comparative study of the optimum pH value of serum alkaline phosphatase in various species of farm animals].

Investigations were carried out on the alkaline phosphatase in the sera of cattle, horses, pigs, sheep, goats, and chickens, the pH value of the buffer used being 9.0-9.8-10.0-10.2-10.6 and 11.0, and the method applied--that of Richterich. The pH value at which the serum alkaline phosphatase in the various farm animals and birds was most active was found to vary to a large extent. Optimal values for the enzyme's activity usually range as follows: cattle, 10.2; pigs and goats, 10.0; sheep,--10.2; horses,--9.8; chickens,--10.6.