CHARACTERIZATION OF SERUM LYSOSOMAL ENZYMATIC-ACTIVITIES .1. EFFECT OF DIETARY UREA IN DAIRY-COWS

The experiment was carried out on ten Holstein dairy cattle fed on conventional concentrate as base diet for 15 days, then turned on unconventional concentrate diet supplemented with 3 \% urea (CM-U) for 45 days to study the effect of four lysosomal enzymes in both states. The N-acetyl-beta-glucosaminidase enzyme level reflected the highest value among other enzymes inspite of its significant drop in the serum after feeding cows on the unconventional ureated diet. Beta-galactosidase was the sole enzyme to rise significantly in the serum of cows during the unconventional ureated diet feeding. Acid phosphatase and alpha-galactosidase showed highly significant decreases due to the effect of the tested diet.