DigitalCommons@University of Nebraska - Lincoln - Grant I. Crawford, Matthew K. Luebbe, Joshua R. Benton, Terry J. Klopfenstein, and Galen E. Erickson: Microbial Characteristics, Microbial Nitrogen Flow, and Urinary Purine Derivative Excretion in Steers Fed at Two Levels of Feed Intake

Nebraska Beef Cattle Reports

Title

Microbial Characteristics, Microbial Nitrogen Flow, and Urinary Purine Derivative Excretion in Steers Fed at Two Levels of Feed Intake

Authors

Grant I. Crawford, University of Nebraska - Lincoln
Matthew K. Luebbe, University of Nebraska - Lincoln
Joshua R. Benton, University of Nebraska - Lincoln
Terry J. Klopfenstein, University of Nebraska - Lincoln
Galen E. Erickson, University of Nebraska - Lincoln

Document Type

Article

Date of this Version

January 2008

Comments

Abstract

Ruminally and duodenally fistulated Holstein steers were fed at 40% and 85% of ad-libitum intake. Microbial purine:N ratio did not differ between intake levels, which makes estimating microbial protein easier in production or experimental settings. Urinary purine derivatives (PD):creatinine (PD:C) ratio and microbial CP flow estimated from the duodenum increased with the higher feeding level. Urinary PD:C and duodenal purine flow were related, suggesting that urinary PD:C ratio can be used to estimate relative differences in microbial CP flow.

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