[Effect of dietary nitrogen compounds and urea on the GLDH and DS activities in broilers]

The influence of concentration of nitrogenous matters (N-matters) and urea supplement in diet for broilers was studied, as exerted on the activities of the enzymes glutamate dehydrogenase (GLDH) and glutamine synthetase (GS) in liver, kidney, tissue and contents of the cecum. If 2% urea had been substituted for a portion of N-matters, no significant differences in the activities of both enzymes in liver and cecum were found. Higher levels of GLDH were recorded in the kidney of broilers given diets with the urea supplement of 17 and 19% N-matters concentrations. The GLDH and GS activities were significantly high in the contents of the cecum, the GLDH activity being the highest with the diet of 19% N-matters concentration. No significant changes in the GLDH activity depending on the concentration of N-matters in the diet were observed in the liver. The GS activity increased moderately with the higher concentration of N-matters.