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 HighWire Citing Articles via Google Scholar Google Scholar Articles by Teeter, R. G. Articles by Mader, T. L. Search for Related Content PubMed Articles by Teeter, R. G. Articles by Mader, T. L.

Ytterbium Chloride as a Marker for Particulate Matter in the Rumen¹

Oklahoma State University, Stillwater 74078

Abstract

Binding strength and capacity of various feedstuffs for ytterbium (Yb), potential for Yb release from feed binding sites and migration to particulate and soluble fractions, and the effect of Yb labelling on in vitro and in situ digestion of feedstuffs were evaluated in four in vitro and two in vivo experiments. All feedstuffs tested formed bonds with Yb. Feeds higher in crude fiber or crude protein bound more Yb (76 to 205 µmol Yb/g feed). Each feedstuff exhibited at least two types of Yb binding sites. Weaker sites within feedstuffs had molar association constants of 4.5 to 9.2 x 10⁵ compared with 1.2 to 3.8 x 10⁷ for stronger sites. Water dialysis of Yb-tagged and washed feedstuffs detached Yb from binding sites at rates ranging from .09 to .57%/h. Ytterbium migration in the rumen from labelled corn grain to unlabelled prairie hay increased Yb content of hay to a level equal to .18% of the corn after 96 h. Release of Yb from feeds was not well correlaed (R² = —.55) with percentage of weak binding sites in feedstuffs. Certain soluble organic compounds formed bonds with Yb. Formation of complexes between rare earths and soluble organic compounds makes it necessary to minimize marker release from labelled feeds. Competition for Yb against five feedstuffs, ranked various solutes from greatest to least, as follows: lactate>acetate>lysine>glucose>glycine>sucrose. Saturating feedstuffs with Yb reduced (P<.05) in vitro and in situ digestibility of dry matter. Ytterbium disappeared from nylon bags at a rate about one-half that of dry matter and totaled 9.3 to 25.3% after 96 h of incubation. Reduced feedstuff digestibility and potential for Yb migration makes the method of Yb application critical for collection of interpretable data.

¹ Journal Article No. 4115 of the Oklahoma Agr. Exp. Sta. Stillwater.

This article has been cited by other articles:

				J. H. Clark, K. C. Olson, T. B. Schmidt, M. L. Linville, D. O. Alkire, D. L. Meyer, G. K. Rentfrow, C. C. Carr, and E. P. Berg Effects of dry matter intake restriction on diet digestion, energy partitioning, phosphorus retention, and ruminal fermentation by beef steers J Anim Sci, December 1, 2007; 85(12): 3383 - 3390. [Abstract] [Full Text] [PDF]

				G. P. Lardy, D. N. Ulmer, V. L. Anderson, and J. S. Caton Effects of increasing level of supplemental barley on forage intake, digestibility, and ruminal fermentation in steers fed medium-quality grass hay J Anim Sci, December 1, 2004; 82(12): 3662 - 3668. [Abstract] [Full Text] [PDF]

				O. Kucuk, B. W. Hess, and D. C. Rule Soybean oil supplementation of a high-concentrate diet does not affect site and extent of organic matter, starch, neutral detergent fiber, or nitrogen digestion, but influences both ruminal metabolism and intestinal flow of fatty acids in limit-fed lambs J Anim Sci, October 1, 2004; 82(10): 2985 - 2994. [Abstract] [Full Text] [PDF]

				W. T. Choat, C. R. Krehbiel, G. C. Duff, R. E. Kirksey, L. M. Lauriault, J. D. Rivera, B. M. Capitan, D. A. Walker, G. B. Donart, and C. L. Goad Influence of grazing dormant native range or winter wheat pasture on subsequent finishing cattle performance, carcass characteristics, and ruminal metabolism J Anim Sci, December 1, 2003; 81(12): 3191 - 3201. [Abstract] [Full Text] [PDF]

				R. Worley, A. Clearfield, and W. C. Ellis Binding affinity and capacities for ytterbium(3+) and hafnium(4+) by chemical entities of plant tissue fragments J Anim Sci, December 1, 2002; 80(12): 3307 - 3314. [Abstract] [Full Text] [PDF]

				P. A. Ludden, T. L. Wechter, and B. W. Hess Effects of oscillating dietary protein on ruminal fermentation and site and extent of nutrient digestion in sheep J Anim Sci, December 1, 2002; 80(12): 3336 - 3346. [Abstract] [Full Text] [PDF]

				W. T. Choat, C. R. Krehbiel, M. S. Brown, G. C. Duff, D. A. Walker, and D. R. Gill Effects of restricted versus conventional dietary adaptation on feedlot performance, carcass characteristics, site and extent of digestion, digesta kinetics, and ruminal metabolism J Anim Sci, October 1, 2002; 80(10): 2726 - 2739. [Abstract] [Full Text] [PDF]