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Urea and Isolated Soybean Protein in Sheep Purified Diets

Oklahoma Agricultural Experiment Station, Stillwater^,2

Abstract

Urea (U) and soybean protein (S) were incorporated in purified diets in the following proportions of total nitrogen: Diet 1, urea; 2, urea + soybean protein; 3, urea + soybean protein; 4, urea + soybean protein; 5, soybean protein. These iso-nitrogenous diets were self-fed to 20 lambs over a 60-day growth and balance trial. Feces and urine were collected for the 60 days and composited into successive 10-day intervals. Growth performance of lambs fed diets containing urea as the sole source of nitrogen were approximately 70% as great as that obtained with soybean protein. Nitrogen retention and carcass data were in accord with this value. Nitrogen retention in all diets increased with time on feed and this was caused by decreased urinary loss.

Plasma glutamic and aspartic acid concentrations were greater in lambs fed diets containing urea rather than soybean protein as the sole nitrogen source. No significant differences were observed in plasma urea or ammonia nitrogen concentrations when urea or soybean protein served as the sole source of nitrogen in purified diets.

¹ Department of Animal Science.

² Approved by the Director.