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The energy of the urine corresponds to 3 to 4% of gross energy ingested 1-4). This means that the amount of energy lost in the urine is not so small as to be ignored in energy balance trials. Thus, it must be determined in the measurement of metabolizable energy. It has been shown that the proportion of urine energy to gross energy ingested stays at a fairly constant level, irrespective of age and body size1). It used to be assumed that urine was substantially an aqueous solution of urea . until RUBNER5) first demonstrated the energy value of excretory products as a unit per gram of nitrogen in the urine. Lyophilization of the urine has been generally applied to determine the energy value of the urine for minimizing the loss of nitrogen from the urine. As moisture occupies the greatest part of the urine, lyophilization requires several hours to obtain urinary solids. Thus, the purpose of the present study was to estimate the energy value of the urine (UE) from the nitrogen content of the urine (UN) using results obtained in energy balance trials reported elsewhere 6-9).

A Note on Estimation of Urinary Energy from Nitrogen Content of Urine in Early Weaned Calves up to 6 Months of Age