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 Dufva, G. S. Articles by Dayton, A. D. Search for Related Content PubMed Articles by Dufva, G. S. Articles by Dayton, A. D.

Content of 2-Aminoethylphosphonic Acid in Feeds, Bacteria and Protozoa and its Role as a Rumen Protozoal Marker¹

Kansas State University, Manhattan 66506

Abstract

A method is described that provides a rapid and accurate determination of 2-aminoethylphosphonic acid (AEP) in feeds and in rumen bacteria and protozoa. A wide variety of feeds examined was devoid of AEP. Six rumen-fistulated cattle were fed either a high roughage (85% hay) or a high concentrate (85% concentrate) diet. Protozoa from cattle fed the high concentrate diet contained more (P<.05) AEP-N in relation to total N (.16%) than did those fed the high roughage diet (.10%). Protozoa from cattle fed the high concentrate diet contained less total N (7.8 vs 8.4%, P<.16) and more lipid (6.2 vs 3.0%, P<.05) than protozoa from cattle fed the high roughage diet. Amino acid N as a percentage of total protozoal N was greater (P<.05) for cattle fed the high roughage diet than for those fed the high concentrate (65.6 vs 57.9%). AEP was .33% of the amino acids in protozoa from cattle fed high concentrate, compared with .19% in protozoa from catde fed high roughage (P<.05). We concluded that to obtain accurate predictions of protozoal production in the rumen based on AEP, it will be necessary to correct for dietary effects on chemical composition of protozoa.

¹ Contribution 81-418-j, Ruminant Nutr. Group, Dept. of Anim. Sci. and Ind., and Dept. of Statist., Kansas Agr. Exp. Sta.