This Wikipedia article linked to elsewhere in this discussion gives the impression that the agricultural methane emissions are primarily a result of enteric fermentation by ruminant livestock.
replyThat's the source of emission by the cow or steer. Industrial processing of the dung produces vastly more.
replyTable 3 in this source [0] shows enteric vs manure methane emissions are 158 vs 137 kg CH4/yr for dairy cows, who are mostly fed in feedlots, and 58 vs 2.4 for meat and other cattle, in the US and Canada. So the CH4 emissions range 65-fold from 2.4 to 158 depending on how the cattle are farmed.
[0] Revised methane emissions factors and spatially distributed annual carbon fluxes for global livestock. https://pmc.ncbi.nlm.nih.gov/articles/pmid/28959823/