Ubiquitous parasites drive a 33% increase in methane yield from livestock

[Display omitted] •Parasitic worms are globally ubiquitous, affecting livestock health and productivity.•We measured methane emissions from parasitised and parasite-free lambs.•Parasitism in lambs can lead to a 33% increase in methane yield (g CH4/kg of feed).•First known study to empirically demons...

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