This collection reviews measurement and modelling of methane emissions and current mitigation strategies, including improving breeding and health, manure management as well as the role of grassland and feed supplements.

Part 1 Analysis1.Measuring methane emissions from livestock: Deli Chen, University of Melbourne, Australia;2.Modelling methane emissions from livestock: Laurence Shalloo, Teagasc, Ireland;Part 2 Breeding, animal husbandry and manure management3.Improving selection for low methane-emitting livestock breeds: Yvette de Haas, Wageningen University, The Netherlands;4.Quantifying the contribution of livestock health issues to the environmental impact of their production systems: Stephen G. Mackenzie, Trinity College Dublin, Ireland; and Ilias Kyriazakis, Queen's University of Belfast, UK;5.Improving livestock manure collection, storage and separation: Barbara Amon, Leibniz Institute for Agricultural Engineering, Germany;6.Developments in anaerobic digestion to optimise use of livestock manure: Yongzhong Feng, Northwest A&F University, China;Part 3 Nutrition7.The impact of improving feed efficiency on the environmental impact of livestock production: James Drackley, University of Illinois, USA;8.Improving grassland/forage quality and management to reduce livestock greenhouse gas emissions: Michael O'Donovan, Teagasc, Ireland;9.The use of feed supplements to reduce livestock greenhouse gas emissions: plant bioactive compounds: Cecile Martin, INRA, France;10.The use of feed supplements to reduce livestock greenhouse gas emissions: direct-fed microbials: Catherine Stanton, Teagasc, Ireland;11.Modifying the rumen environment to reduce livestock greenhouse gas emissions: Tim McAllister, Agriculture and Agri-Food Canada, Canada;