Selected Alternative Feed Additives Used to Manipulate the Rumen Microbiome

Area of Science:

• Animal Science
• Microbiology
• Environmental Science

Background:

• Increased ruminant populations lead to higher nutrient demands and significant methane emissions, impacting energy efficiency (up to 12% loss).
• Restrictions on antibiotic use in animal husbandry necessitate the development of safe, effective alternatives.

Purpose of the Study:

• To review innovative feed additives that can improve digestive health and reduce methane production in ruminants.
• To identify alternatives to antibiotics that are safe for humans and the environment.

Main Methods:

• Literature review of studies on feed additives affecting the ruminant digestive microbiome.
• Selection of additives based on their potential to improve animal health indicators and/or reduce methane output.

Main Results:

• Probiotics, prebiotics, and synbiotics are leading research areas for modulating the gut microbiome.
• Algae (e.g., *Gelidium amansii*) and plant-derived additives (e.g., essential oils, fermented wheat straw) are gaining popularity.
• These additives are often recognized as Generally Recognized As Safe (GRAS) for human and environmental health.

Conclusions:

• Innovative feed additives show promise in addressing methane emissions and antibiotic reduction in ruminant farming.
• Natural feed additives offer sustainable solutions for improving animal health and environmental impact.