Dietary Ruminant Enteric Methane Mitigation Strategies: Current Findings, Potential Risks and Applicability

Area of Science:

• Agricultural Science
• Animal Science
• Environmental Science

Background:

• Ruminant livestock are significant sources of enteric methane emissions.
• Mitigating methane is crucial for environmental sustainability and climate change goals.

Purpose of the Study:

• To review current knowledge on dietary ruminant enteric methane mitigation strategies.
• To evaluate their effectiveness, modes of action, risks, and applicability.

Main Methods:

• Literature review of scientific studies on various methane mitigation strategies.
• Analysis of nutritional interventions, including specific additives and forage quality.
• Examination of potential harms, risks, and practical implementation challenges.

Main Results:

• Several strategies show promise, including 3-nitrooxypropanol, red seaweed, tannins, saponins, essential oils, nitrates, and sulfates.
• Forage quality and plant secondary metabolites offer alternative mitigation approaches.
• Some effective strategies like monensin and halogenated hydrocarbons face legal restrictions.

Conclusions:

• A range of dietary strategies can reduce ruminant methane emissions.
• Balancing efficacy with animal health, safety, and practical application is essential for successful implementation.
• Further research into sustainable and widely applicable methods is warranted.