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To test the hypothesis that sheep live weight (LW) could be used to improve enteric methane (CH 4 ) emission calculations, mature ewes of 4 different breeds representative of the UK sheep industry were studied: Welsh Mountain, Scottish Blackface, Welsh Mule and Texel (n = 8 per breed). The ewes were housed and offered  ad libitum  access to fresh cut pasture of three different types, varying in digestibility: (a) a relatively high digestibility monoculture of perennial ryegrass ( Lolium perenne ), (b) a medium digestibility permanent pasture comprising a range of grass species, and (c) a relatively low digestibility native grassland pasture comprising mainly  Molinia caerulea . Individual LW, feed dry matter intake (DMI), and CH 4  emissions in chambers were measured. The linear functional relationship between DMI and CH 4  emissions was positive ( r  = 0.77) with little breed effect. The relationships between LW and DMI, and LW and CH 4  emissions were also positive but weaker, regardless of pasture type. It is concluded that change to LW was a poor indicator of DMI and has limited value in the prediction of enteric CH 4  emissions from mature ewes.

Can live weight be used as a proxy for enteric methane emissions from pasture-fed sheep?