Impact of dietary forage proportion and crossbreeding on feed efficiency and methane emissions in lactating dairy cows
aDepartment of Animal Sciences, School of Agriculture, Policy and Development, University of Reading, Reading RG6 6EU, United Kingdom
bAgri-Food and Biosciences Institute, Hillsborough, Co. Down BT26 6DR, United Kingdom
cAgri-Food and Biosciences Institute, Statistical Services Branch, Newforge Lane, Belfast, Co. Antrim BT9 5PX, United Kingdom
dInstitute for Global Food Security, Queen's University Belfast, Belfast BT9 5DL, United Kingdom
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