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

This Article Full Text Full Text (PDF) Interpretive Summary 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 Taghizadeh, A. Articles by Stanford, K. Search for Related Content PubMed PubMed Citation Articles by Taghizadeh, A. Articles by Stanford, K.

Digestion of Feed Amino Acids in the Rumen and Intestine of Steers Measured Using a Mobile Nylon Bag Technique

¹ Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashad, Iran 91775-1163
² Alberta Agriculture, Food and Rural Development, Lethbridge, Alberta, Canada T1J 4V6

Corresponding author: Akbar Taghizadeh; e-mail: ataghius2000{at}yahoo.com.

The disappearance of dry matter (DM), crude protein (CP), and amino acids (AA) in steers after rumen incubation and intestinal passage of alfalfa hay, barley hay, corn silage, barley grain, corn grain, wheat bran, meat meal, fish meal, cottonseed meal, and soybean meal were measured in 3 steers using a mobile nylon bag technique. Ruminal degradation of individual AA differed between feedstuffs. For barley hay and corn silage, the ruminal disappearance of total AA was higher and lower than the other feedstuffs, respectively. The intestinal digestibility of total AA in alfalfa hay was lower than the digestion of CP. The intestinal digestibility of Arg and His was higher than that of total AA in alfalfa hay, meat meal, cottonseed meal, soybean meal, barley hay, and wheat bran. In addition, the intestinal digestibility of Lys was higher than that of total AA in alfalfa hay, meat meal, cottonseed meal, soybean meal, barley hay, corn silage, and wheat bran. The intestinal disappearance of CP in most cases was higher than that of DM. The results indicated that feedstuffs with lower ruminal disappearance of DM, CP, total AA, essential AA, and nonessential AA generally had a higher intestinal disappearance, resulting in a relatively constant total tract disappearance. These results could be used to improve the current system of diet formulation in ruminants.

Key Words: dry matter • crude protein • amino acid • mobile bag

Abbreviation key: AH = alfalfa hay, BG = barley grain, BH = barley hay, CG = corn grain, CS = corn silage, CSM = cottonseed meal, EAA = essential AA, FM = fish meal, MM = meat meal, NEAA = nonessential AA, SBM = soybean meal, WB = wheat bran