24 hours day cycle variations of serum alkaline phosphatase activity in piglets

The activity of serum alkaline phosphatase in pigs changes in relation to the age of the animals [2, 4, 5, 7]. In chicken [3] it was observed that the activity of alkaline phosphatase showed cyclic fluctuations during the process of egg formation, but in the 24 hours day cyclic the activity of the enzyme was not increasing as far as the process of shell calcification was not taking place. In the presently reported work circadian fluctuations of alkaline phosphatase activity were investigated in the serum of piglets.