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 Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Streeter, C. L. Articles by Scott, R. A. Search for Related Content PubMed PubMed Citation Articles by Streeter, C. L. Articles by Scott, R. A.

Influence of Rate of Ruminal Administration of Urea on Nitrogen Utilization in Lambs¹

University of Kentucky, Lexington 40506

Abstract

A 4 x 4 latin square design was utilized in which four lambs each received the following rations: (1) a 6% crude protein basal ration of wheat straw, corn, molasses, minerals and vitamins, (2) basal ration plus 70 g crude protein equivalent from urea infused into the rumen in two equal portions, (3) basal ration plus 70 g crude protein equivalent from urea administered by continuous infusion into the rumen, and (4) basal ration plus 70 g crude protein equivalent from isolated soy protein administered into the rumen in two equal portions.

Nitrogen reaching the abomasum and nitrogen balance were increased significantly by all three methods of furnishing additional nitrogen. Ruminal ammonia data demonstrated that continuous infusion of urea provided a much more sustained release of ammonia in the rumen than did urea infusion twice daily. The ruminal ammonia levels in lambs receiving continuously infused urea were essentially constant but somewhat higher than in those receiving soy protein twice daily. Although a constant release of ammonia in the rumen was achieved, there was no detectable difference in the efficiency of the utilization of nitrogen as indicated by the lack of difference betwen the twice daily and continuous administration of urea in nitrogen balance or in total nitrogen or tungstic acid precipitable nitrogen passing the abomasum.

¹ The investigation reported in this paper (72–5–50) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the director.