J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J. Anim Sci. 1986. 62:830-843.
© 1986 American Society of Animal Science
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Goetsch, A. L.
Right arrow Articles by Owens, F. N.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Goetsch, A. L.
Right arrow Articles by Owens, F. N.

Effects of Dietary Nitrogen Level and Ileal Antibiotic Administration on Digestion and Passage Rates in Beef Heifers. I. High-Concentrate Diets1

A. L. Goetsch and F. N. Owens

Oklahoma State University2, Stillwater 74078

Abstract

Four beef heifers (211 kg) fitted with ruminal, duodenal and ileal cannulae (T-type), were fed a high-concentrate diet with a low (L) or high (H) level of N (1.71 and 2.18%, respectively), and received daily doses of either saline (S) or an antibiotic (A) mixture (2 g neomycin sulfate and .25 g bacitracin) into the terminal ileum in a 4 x 4 Latin-square experiment Added N increased ruminal NH3-N concentration and tended to increase efficiency of microbial growth and to decrease ruminal disappearance of organic matter, starch and protein. Administration of antibiotics into the ileum reduced nucleic acid content of feces (P<.05), tended to reduce digestion of organic matter and starch in the hindgut and total tract and increased ileal pH (P<.05). Ileal administration of antibiotics increased ruminal escape of feed N by 26 and 42% with the low and high N diets, respectively, an d increased ruminal passage rate of particulates. Ruminal N digestion was inversely related to ruminal particulate passage rate (r=–.49; P<.06). Ruminal liquid passage rate was inversely related to rate of fluid passage through the hindgut and was reduced by ileal administration of antibiotics with the low N diet, but increased by antibiotics with the high N diet. Results indicate that administration of antibiotics into the terminal ileum alters digestive function earlier in die digestive tract including ruminal passage rates and digestion of N in the rumen. Responses were partially modulated by dietary N level.

Footnotes

1 Journal Article No. 4570 of the Oklahoma Agr. Exp. Sta., Stillwater 74078.

2 Anim. Sci. Dept.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1986 by the American Society of Animal Science.