The effects of energy levels on nitrogen components of urine

IN STUDIES concerning nitrogen metabolism in chickens, the interrelated metabolism of the energy nutrients (carbohydrates and fats) and protein present a problem in the formulation of rations. The effects of dietary energy levels on nitrogen components of the urine has not been extensively investigated. The findings of urinary nitrogen components were reviewed by O’Dell et al. (1960). These workers also presented data on urinary nitrogen components as influenced by various protein sources. It was of interest in this laboratory to determine whether dietary energy levels would affect the nitrogen components of avian urine while being maintained on an iso-protein ration. MATERIALS AND METHODS Twelve hens (S.C. White Leghorn) were selected and placed in an air-conditioned room (75° ± 1°F.). Surgical techniques used for the separate collection of feces and urine were similar to those described by Dixon and Wilkinson (1957) and Dixon (1958) and modified by Richardson et al., (1960).