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The Utilization of Urea and Soybean Oil Meal Nitrogen by Steers¹

Department of Animal Husbandry, University of Hawaii, Honolulu, T. H.

Abstract

Nitrogen balance experiments were conducted on four steers. In addition, one group of four steers was fed a ration of low-nitrogen content and a second group a similar ration with a substitution of 6.0% urea. These steers were slaughtered and the rumen contents were analyzed for total nitrogen, urea and ammonia.

Under the conditions of these experiments the conclusions are:

1. The endogenous nitrogen of 6 to 8 month old steers averages 0.034 gm. per kgm. of body weight or 2.10 gm. per square meter of body surface. The metabolic nitrogen in the feces averages 0.489 gm. per 100 gm. of dry matter consumed.
   
2. The apparent digestion coefficient of urea nitrogen when fed to 6 to 8 month old steers is 74 and that of soybean oil meal 78. When corrected, for the metabolic nitrogen in the feces, the values are 94 for each source of nitrogen.
   
3. The biological value of urea nitrogen when fed to 6 to 8 month old steers is 34 and that of soybean oil meal nitrogen 60 when fed at 11 and 14% protein equivalent levels.
   

¹ Technical paper 112 of The Hawaii Agricultural Experiment Station.

² Formerly Junior Animal Husbandman.

³ Formerly Associate Animal Husbandman.

⁴ Animal Husbandman.