skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Evaluation of procedures for estimating ruminal particle turnover and diet digestibility in ruminant animals

Abstract

Procedures used in estimating ruminal particle turnover and diet digestibility were evaluated in a series of independent experiments. Experiment 1 and 2 evaluated the influence of sampling site, mathematical model and intraruminal mixing on estimates of ruminal particle turnover in beef steers grazing crested wheatgrass or offered ad libitum levels of prairie hay once daily, respectively. Particle turnover rate constants were estimated by intraruminal administration (via rumen cannula) of ytterbium (Yb)-labeled forage, followed by serial collection of rumen digesta or fecal samples. Rumen Yb concentrations were transformed to natural logarithms and regressed on time. Influence of sampling site (rectum versus rumen) on turnover estimates was modified by the model used to fit fecal marker excretion curves in the grazing study. In contrast, estimated turnover rate constants from rumen sampling were smaller (P < 0.05) than rectally derived rate constants, regardless of fecal model used, when steers were fed once daily. In Experiment 3, in vitro residues subjected to acid or neutral detergent fiber extraction (IVADF and IVNDF), acid detergent fiber incubated in cellulase (ADFIC) and acid detergent lignin (ADL) were evaluated as internal markers for predicting diet digestibility. Both IVADF and IVNDF displayed variable accuracy for prediction of in vivomore » digestibility whereas ADL and ADFIC inaccurately predicted digestibility of all diets.« less

Authors:
Publication Date:
Research Org.:
New Mexico State Univ., Las Cruces (USA)
OSTI Identifier:
6645058
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; RUMINANTS; DIGESTION; CATTLE; DIET; FORAGE; GRASS; LABELLED COMPOUNDS; TRACER TECHNIQUES; YTTERBIUM; ANIMAL FEEDS; ANIMALS; DOMESTIC ANIMALS; ELEMENTS; FOOD; ISOTOPE APPLICATIONS; MAMMALS; METALS; PLANTS; RARE EARTHS; VERTEBRATES; 550301* - Cytology- Tracer Techniques

Citation Formats

Cochran, R C. Evaluation of procedures for estimating ruminal particle turnover and diet digestibility in ruminant animals. United States: N. p., 1985. Web.
Cochran, R C. Evaluation of procedures for estimating ruminal particle turnover and diet digestibility in ruminant animals. United States.
Cochran, R C. Tue . "Evaluation of procedures for estimating ruminal particle turnover and diet digestibility in ruminant animals". United States.
@article{osti_6645058,
title = {Evaluation of procedures for estimating ruminal particle turnover and diet digestibility in ruminant animals},
author = {Cochran, R C},
abstractNote = {Procedures used in estimating ruminal particle turnover and diet digestibility were evaluated in a series of independent experiments. Experiment 1 and 2 evaluated the influence of sampling site, mathematical model and intraruminal mixing on estimates of ruminal particle turnover in beef steers grazing crested wheatgrass or offered ad libitum levels of prairie hay once daily, respectively. Particle turnover rate constants were estimated by intraruminal administration (via rumen cannula) of ytterbium (Yb)-labeled forage, followed by serial collection of rumen digesta or fecal samples. Rumen Yb concentrations were transformed to natural logarithms and regressed on time. Influence of sampling site (rectum versus rumen) on turnover estimates was modified by the model used to fit fecal marker excretion curves in the grazing study. In contrast, estimated turnover rate constants from rumen sampling were smaller (P < 0.05) than rectally derived rate constants, regardless of fecal model used, when steers were fed once daily. In Experiment 3, in vitro residues subjected to acid or neutral detergent fiber extraction (IVADF and IVNDF), acid detergent fiber incubated in cellulase (ADFIC) and acid detergent lignin (ADL) were evaluated as internal markers for predicting diet digestibility. Both IVADF and IVNDF displayed variable accuracy for prediction of in vivo digestibility whereas ADL and ADFIC inaccurately predicted digestibility of all diets.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

Thesis/Dissertation:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this thesis or dissertation.

Save / Share: