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Related Experiment Video

Updated: May 23, 2026

The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

Published on: September 7, 2015

Strategies for optimizing nitrogen use by ruminants.

S Calsamiglia¹, A Ferret, C K Reynolds

¹1Department of Animal and Food Sciences, Servei de Nutrició i Benestar Animal, Universitat Autónoma de Barcelona, 08193-Bellaterra, Spain.

Animal : an International Journal of Animal Bioscience

|March 27, 2012

Summary

Improving nitrogen (N) utilization in ruminants, which is typically low, requires understanding key metabolic processes. Strategies focusing on rumen function and amino acid metabolism in the mammary gland can enhance N efficiency and production performance.

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The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

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Published on: March 21, 2016

Area of Science:

Animal Nutrition
Ruminant Metabolism
Nitrogen Utilization

Background:

Ruminants exhibit low and variable nitrogen (N) utilization efficiency (around 25%), impacting production and the environment.
Existing strategies have improved understanding but not significantly increased overall N utilization efficiency.

Purpose of the Study:

To explore key mechanisms controlling N metabolism in ruminants for improved efficiency.
To identify strategies for optimizing production and N utilization through a deeper understanding of N metabolism.

Main Methods:

Analysis of nitrogen capture efficiency in the rumen and protein degradation.
Investigation of rumen microflora roles in peptide degradation and amino acid deamination.
Examination of urea transport across the rumen wall and amino acid metabolism in portal-drained viscera and liver.

Main Results:

Rumen N capture and protein degradation are critical factors.
Limited net N recycling into the rumen is observed, but urea transport offers potential for improvement.
Mammary gland plays a crucial role in N utilization by utilizing amino acids before the portal-drained viscera and liver.

Conclusions:

Optimizing rumen function and understanding amino acid metabolism in the mammary gland are key to enhancing N utilization efficiency.
Developing targeted dietary strategies based on these insights can improve ruminant production performance and reduce environmental impact.