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 Evans, J. L. Articles by Davis, G. K. Search for Related Content PubMed Articles by Evans, J. L. Articles by Davis, G. K.

Dietary Phosphorus, Sulfur and Molybdenum and Mineral Composition of Rumen Fluid¹

University of Florida, Gainesville³

Abstract

The effects of varying dietary levels of P, S and Mo upon the levels of P, S and Cu in the rumen fluid during 32 in vivotrials were determined. Two experiments were carried out with four steers during eight consecutive 25-day periods. The first trial considered steer uniformity, and the second trial involved mineral interrelationships using a factorial design. Twenty-five-day pretrial P levels of 0.04, 0.16 and 0.54% did not exert carryover effects during the following 25-day trial periods with 0.04, 0.16 and 0.54% dietary P. These dietary P levels resulted in 0.87, 2.30 and 2.87% P in the rumen fluid dry matter or 198, 417 and 543 mcg. per ml. of rumen fluid (r=0.77, P<.01). Rumen fluid P tended to plateau just above 0.16% dietary P or at 31 mg. per kg. of body weight. Below 0.16% of dietary P both the animal and the rumen microorganisms reflected a P deficiency. With dietary P, S and Mo levels of 0.16, 0.15 and 0.00015%, respectively, rumen fluid levels of S and Cu were 0.26 and 0.0004% in the dry matter and 49 and 0.07 mcg. per ml. in the rumen fluid, respectively. By increasing dietary S as Na₂SO₄ to 0.55%, S increased to 0.41% and 91 mcg. per ml. in the dry matter and liquid of the rumen fluid, respectively. P was concentrated in the rumen fluid to a greater degree than S.

¹ Florida Agricultural Experiment Stations Journal Series No. 2156

² Present address: Department of Animal Sciences, Rutgers University, New Brunswick, New Jersey.

³ Nutrition Laboratory, Department of Animal Science.

This article has been cited by other articles:

				A. D. Guyton, J. M. McKinney, and K. F. Knowlton The Effect of Steam-Flaked or Dry Ground Corn and Supplemental Phytic Acid on Phosphorus Partitioning and Ruminal Phytase Activity in Lactating Cows J Dairy Sci, December 1, 2003; 86(12): 3972 - 3982. [Abstract] [Full Text] [PDF]