Novel oxidising feed additives reduce in vitro methane emissions using the rumen simulation technique

Area of Science:

• Agricultural Science
• Animal Nutrition
• Environmental Science

Background:

• Enteric methane (CH4) from ruminants is a major greenhouse gas and an energy loss.
• Oxidizing compounds are explored as novel antimethanogenic agents for ruminant feeds.

Purpose of the Study:

• To assess the efficacy of urea hydrogen peroxide (UHP) and magnesium peroxide (MgO2) in reducing CH4 production in vitro.
• To investigate the effects of these compounds on total gas production (TGP), volatile fatty acid (VFA) profiles, and nutrient disappearance.

Main Methods:

• In vitro rumen simulation technique with a 50:50 grass silage:concentrate diet.
• Tested various concentrations of UHP (with/without KI) and MgO2, based on oxygen delivery.
• Measured CH4 production, TGP, VFA profiles, and nutrient disappearance.

Main Results:

• All treatments reduced CH4 parameters in a dose-dependent manner.
• 1x UHP + KI significantly reduced CH4 by 64% and CH4 per digestible organic matter by 71%.
• Treatments altered VFA profiles, reducing acetate and butyrate while increasing propionate and valerate.

Conclusions:

• Oxidizing compounds show potential for reducing enteric CH4 emissions in ruminants.
• Dose and oxygen delivery are critical factors for CH4 suppression.
• Further research into slow-release oxygen sources is recommended for sustained CH4 reduction.