HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Davis, G. V. Articles by Stallcup, O. T. Search for Related Content PubMed Articles by Davis, G. V. Articles by Stallcup, O. T.

Influence of Dietary Nitrogen on Nitrogen Metabolism in the Rumen^{1, 2,}

Department of Animal Industry and Veterinary Science, University of Arkansas, Fayetteville

ABSTRACT

In vivo trials, utilizing four fistulated steers in a Latin-square design, were conducted with four rations: casein + basal, urea + basal, soybean meal + basal, and cottonseed hulls (basal). Nitrogenous constituents, volatile fatty acids (VFA), and pH values were determined on rumen liquor taken at various intervals after feeding. Levels of urea nitrogen were determined on the jugular blood.

The concentration of ammonia present in the rumen over a 12-hr period from the urea or casein ration was significantly higher (P < 0.01) than that observed when the basal ration was fed. The concentration of ammonia from the urea ration was significantly higher (P < 0.01) than that observed when the soybean meal ration was fed. Feeding of urea resulted in a significantly higher (P < 0.05) concentration of ammonia than did casein.

Total VFA were influenced by nitrogen substrate. The casein ration was associated with greater quantities of propionic, butyric, and valeric acids than that observed when the other rations were fed, whereas the urea ration was associated with the highest quantity of acetic acid.

¹ Taken from a thesis presented to the Graduate School, University of Arkansas, by G. V. Davis, in partial fulfillment of the requirements for the M.S. degree.

² Published with the approval of the Director of the Arkansas Agricultural Experiment Station.