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 Similar articles in PubMed 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 Woodford, S. T. Articles by Holmes, K. R. Search for Related Content PubMed PubMed Citation Articles by Woodford, S. T. Articles by Holmes, K. R.

Ruminal Bypass of Drinking Water in Lactating Cows¹

University of Illinois, Urbana 61801

ABSTRACT

Drinking water that does not equilibrate with ruminal fluid, i.e., bypasses the rumen, was studied qualitatively and quantitatively in eight rumen-fistulated lactating Holstein cows. Decreased temperatures in the sulcus omasi and abomasum shortly after initiation of drinking indicated that water had bypassed the rumen. Recovery of a water-soluble marker, included in drinking water offered after water was withheld for 4.5 or 9 h following feeding, was used to estimate ruminal bypass. For respective treatments, 18 and 5% of drinking water was calculated to have bypassed the rumen. Ruminal bypass in lactating cows drinking relatively large amounts of water could affect comparisons of water intake with total ruminal fluid outflow as measured by dilution of a water-soluble marker. Drinking water should not be assumed to equilibrate with ruminal fluid.

¹ Supported by Illinois Agricultural Experiment Station, Hatch 35-0360.

² Department of Dairy Science.

³ Department of Veterinary Biosciences.

This article has been cited by other articles:

				J. Doelman, N. G. Purdie, V. R. Osborne, and J. P. Cant Short Communication: The Effects of Histidine-Supplemented Drinking Water on the Performance of Lactating Dairy Cows J Dairy Sci, October 1, 2008; 91(10): 3998 - 4001. [Abstract] [Full Text] [PDF]

				V. R. Osborne, S. Radhakrishnan, N. E. Odongo, A. R. Hill, and B. W. McBride Effects of supplementing fish oil in the drinking water of dairy cows on production performance and milk fatty acid composition J Anim Sci, March 1, 2008; 86(3): 720 - 729. [Abstract] [Full Text] [PDF]

				S. Seo, C. Lanzas, L. O. Tedeschi, and D. G. Fox Development of a Mechanistic Model to Represent the Dynamics of Liquid Flow Out of the Rumen and to Predict the Rate of Passage of Liquid in Dairy Cattle J Dairy Sci, February 1, 2007; 90(2): 840 - 855. [Abstract] [Full Text] [PDF]