Short communication: Correlation of methane production, intensity, and yield with residual feed intake throughout lactation in Holstein cows

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Fresco, Solène | Boichard, Didier | Lefebvre, Rachel | Barbey, Sarah | Gaborit, M. | Fritz, Sébastien | Martin, Pauline

Edité par CCSD ; Published by Elsevier (since 2021) / Cambridge University Press (until 2020) -

International audience. The environmental impact of dairy production can be reduced in several ways, including increasing feed efficiency and reducing methane (CH4) emissions. There is no consensus on their relationship. This studyaimed at estimating the correlations between residual feed intake (RFI) and CH4 emissions expressed in g/d methane production (MeP), g/kg of fat- and protein-corrected milk methane intensity (MeI), or g/kgof DM intake methane yield (MeY) throughout lactation. We collected CH4 data using GreenFeed devices from 107 Holstein cows, as well as production and intake phenotypes. RFI was predicted from DM intake,fat- and protein-corrected milk, BW, and body condition score. Five-trait random regression models were used to estimate the individual variance components of the CH4 and production traits, which were usedto calculate the correlations between RFI and CH4 traits throughout lactation. We found positive correlations of RFI with MeP and MeI ranging from 0.05 to 0.47 throughout the lactation. Correlations betweenRFI and MeY are low and vary from positive to negative, ranging from -0.18 to 0.17. Both MeP and MeI are favorably correlated with RFI, as is MeY during the first half of lactation. These correlations are mostlyfavorable for genetic selection, but the confirmation of these results is needed with genetic correlations over a larger dataset.

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