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August 19, 2025Animal Production ScienceOpen Access

Feeding concentrate pellets to early-lactation cows consuming spring ryegrass pasture did not reduce methane emissions

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Randomized trial showed no reduction in methane emissions with concentrate feed in spring pastures, suggesting challenges for mitigation efforts.

Cows fed supplementary concentrate had 7.6% greater total dry-matter intake compared to those on pasture only, indicating potential benefits for intake.
Overall milk solids production increased by 6.9% in cows consuming supplementary feed, suggesting improved efficiency vs. standard pasture feeding.
Despite the increase in intake and milk production, methane emissions per cow did not significantly decrease, pointing to concerns about methane yield.
The findings highlight the economic implications and indicate that the use of concentrates may not effectively mitigate methane in pasture-based systems.

Garrett et al. (2025) studied this question.

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Randomized trial showed no reduction in methane emissions with concentrate feed in spring pastures, suggesting challenges for mitigation efforts.