A Jonker S M Hickey S J Rowe P H Janssen G Shackell S Elmes W E Bain J Wing G J Greer B Bryson S MacLean K G Dodds C S Pinares-Patiño E A Young K Knowler N K Pickering J C McEwan (2018). Genetic parameters of methane emissions determined using portable accumulation chambers in lambs and ewes grazing pasture and genetic correlations with emissions determined in respiration chambers. Journal of Animal Science. https://doi.org/10.1093/jas/sky187Read more (external link)