1. bookVolume 18 (2018): Issue 2 (May 2018)
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Journal
eISSN
2300-8733
First Published
25 Nov 2011
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4 times per year
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English
access type Open Access

Urea Metabolism and Regulation by Rumen Bacterial Urease in Ruminants – A Review

Published Online: 11 May 2018
Volume & Issue: Volume 18 (2018) - Issue 2 (May 2018)
Page range: 303 - 318
Received: 27 Apr 2017
Accepted: 06 Sep 2017
Journal Details
License
Format
Journal
eISSN
2300-8733
First Published
25 Nov 2011
Publication timeframe
4 times per year
Languages
English
Abstract

Urea is used as non-protein nitrogen in the rations of ruminants as an economical replacement for feed proteins. Urea transferred from the blood to the rumen is also an important source of nitrogen for rumen microbial growth. It is rapidly hydrolyzed by rumen bacterial urease to ammonia (NH3) and the NH3 is utilized for the synthesis of microbial proteins required to satisfy the protein requirements of ruminants. Urea has commonly become an accepted ingredient in the diets of ruminants. In recent decades, urea utilization in ruminants has been investigated by using traditional research methods. Recently, molecular biotechnologies have also been applied to analyze urea-degrading bacteria or urea nitrogen metabolism in ruminants. Combining traditional and molecular approaches, we can retrieve better information and understanding related to the mechanisms of urea metabolism in ruminants. This review focuses on urea utilization in ruminants and its regulation by rumen bacterial urease in the host. The accumulated research provides foundations for proposing further new strategies to improve the efficiency of urea utilization in ruminants.

Keywords

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