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Estimating Urine Energy from Urine Nitrogen¹

Utah State University,² Logan

Abstract

An apparent relationship between the energy of urine and its nitrogen content was investigated by comparing 402 sets of analyses of urine from cattle and sheep. The overall correlation between urine nitrogen (UN) and urine energy (UE) values yielded an r² of 0.92, while the correlations from 114 observations with cattle urine gave an r² of 0.66 and from 288 observations with sheep urine gave an r² of 0.94. Equations for the estimate of urine energy were found as follows: cattle, UE_kcal./gm.=0.022+0.118(UN%); sheep, UE_kcal./gm.=0.027+0.119 (UN%); and overall, UE_kcal./gm.=0.026+0.117(UN%). No significant differences were found between the linear regressions for the sheep and cattle data. The overall equation should, therefore, be a useful method for estimating urine energy applicable to both cattle and sheep consuming conventional diets.

¹ Journal Paper No. 353, Utah Agricultural Experiment Station. Presented at the American Society of Animal Science meetings, Corvallis, Oregon, August 1963.

² Department of Animal Husbandry.