Short communication: Development of an equation for estimating methane emissions of dairy cows from milk Fourier transform mid-infrared spectra by using reference data obtained exclusively from respiration chambers

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dc.contributor.authorVanlierde, A.
dc.contributor.authorSoyeurt, H.
dc.contributor.authorGengler, N.
dc.contributor.authorColinet, F. G.
dc.contributor.authorFroidmont, E.
dc.contributor.authorKreuzer, M.
dc.contributor.authorGrandl, F.
dc.contributor.authorBell, M.
dc.contributor.authorLund, P.
dc.contributor.authorOlijhoek, D. W.
dc.contributor.authorEugène, M.
dc.contributor.authorMartin, C.
dc.contributor.authorKuhla, B.
dc.contributor.authorDehareng, F.
dc.date.accessioned2021-06-10T15:08:19Z
dc.date.available2021-06-10T15:08:19Z
dc.date.issued2018-05-09
dc.descriptionPublication history: Accepted - 1 April 2018; Published online - 9 May 2018.en_US
dc.description.abstractEvaluation and mitigation of enteric methane (CH4) emissions from ruminant livestock, in particular from dairy cows, have acquired global importance for sustainable, climate-smart cattle production. Based on CH4 reference measurements obtained with the SF6 tracer technique to determine ruminal CH4 production, a current equation permits evaluation of individual daily CH4 emissions of dairy cows based on milk Fourier transform mid-infrared (FT-MIR) spectra. However, the respiration chamber (RC) technique is considered to be more accurate than SF6 to measure CH4 production from cattle. This study aimed to develop an equation that allows estimating CH4 emissions of lactating cows recorded in an RC from corresponding milk FT-MIR spectra and to challenge its robustness and relevance through validation processes and its application on a milk spectral database. This would permit confirming the conclusions drawn with the existing equation based on SF6 reference measurements regarding the potential to estimate daily CH4 emissions of dairy cows from milk FT-MIR spectra. A total of 584 RC reference CH4 measurements (mean ± standard deviation of 400 ± 72 g of CH4/d) and corresponding standardized milk mid-infrared spectra were obtained from 148 individual lactating cows between 7 and 321 d in milk in 5 European countries (Germany, Switzerland, Denmark, France, and Northern Ireland). The developed equation based on RC measurements showed calibration and cross-validation coefficients of determination of 0.65 and 0.57, respectively, which is lower than those obtained earlier by the equation based on 532 SF6 measurements (0.74 and 0.70, respectively). This means that the RC-based model is unable to explain the variability observed in the corresponding reference data as well as the SF6-based model. The standard errors of calibration and cross-validation were lower for the RC model (43 and 47 g/d vs. 66 and 70 g/d for the SF6 version, respectively), indicating that the model based on RC data was closer to actual values. The root mean squared error (RMSE) of calibration of 42 g/d represents only 10% of the overall daily CH4 production, which is 23 g/d lower than the RMSE for the SF6- based equation. During the external validation step an RMSE of 62 g/d was observed. When the RC equation was applied to a standardized spectral database of milk recordings collected in the Walloon region of Belgium between January 2012 and December 2017 (1,515,137 spectra from 132,658 lactating cows in 1,176 different herds), an average ± standard deviation of 446 ± 51 g of CH4/d was estimated, which is consistent with the range of the values measured using both RC and SF6 techniques. This study confirmed that milk FT-MIR spectra could be used as a potential proxy to estimate daily CH4 emissions from dairy cows provided that the variability to predict is covered by the model.en_US
dc.description.sponsorshipThe authors are grateful to their fellow researchers with regard to collecting methane and milk samples. The OptiMIR (INTERREG IVB North-West Europe funded; www .optimir .eu) and the COST Methagene (COST-Horizon 2020 funded; www .methagene .eu) European projects are gratefully acknowledged for facilitating networking between research teams and data exchange. The authors thank the Walloon Breeding Association (Ciney, Belgium) and Comité du lait (Battice, Belgium) for providing access to data related to the Walloon milk recording. The Association of Swiss Cattle Breeders (Zollikofen, Switzerland) is acknowledged for providing the milk Fourier transform mid-infrared spectral data of the Swiss samples. Part of the work has been funded by the EU project GplusE (http:// www .gpluse .eu), especially research conducted at the Agri-Food and Biosciences Institute (AFBI) in Northern Ireland, and facilitation of data exchanges. The GplusE project has received funding from the European Union’s Seventh Framework Programme for research, technological development, and demonstration under grant agreement n° 613689. The views expressed in this publication are the sole responsibility of the authors and do not necessarily reflect the views of the European Commission. Research conducted at Leibniz Institute for Farm Animal Biology (FBN) in Germany was partially funded by the optiKuh project supported by the German Federal Ministry of Food and Agriculture (BMBL) through the Federal Office for Agriculture and Food (BLE). Research conducted in France at the French National Institute for Agricultural Research (INRA) was funded by the French National Research Agency (ANR) through the Joint Programming Initiative on Agriculture, Food Security and Climate Change (FACCE-JPI). Global Network program (ANR-13-JFAC-0003-01). Research conducted in Denmark at Aarhus University was funded by the Danish Milk Levy Fund and Aarhus University.en_US
dc.identifierhttp://hdl.handle.net/20.500.12518/268
dc.identifier.citationVanlierde, A., Soyeurt, H., Gengler, N., Colinet, F. G., Froidmont, E., Kreuzer, M., Grandl, F., Bell, M., Lund, P., Olijhoek, D. W., Eugène, M., Martin, C., Kuhla, B. and Dehareng, F. (2018) ‘Short communication: Development of an equation for estimating methane emissions of dairy cows from milk Fourier transform mid-infrared spectra by using reference data obtained exclusively from respiration chambers’, Journal of Dairy Science, 101(8), pp. 7618–7624. doi: 10.3168/jds.2018-14472.en_US
dc.identifier.issn0022-0302
dc.identifier.urihttps://doi.org/10.3168/jds.2018-14472
dc.language.isoenen_US
dc.publisherFASS Inc. and Elsevier Inc.en_US
dc.rights© 2018, THE AUTHORS. Published by FASS Inc. and Elsevier Inc. on behalf of the American Dairy Science Association®. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).en_US
dc.subjectcattleen_US
dc.subjectgreenhouse gasen_US
dc.subjectspectroscopyen_US
dc.subjectproxyen_US
dc.titleShort communication: Development of an equation for estimating methane emissions of dairy cows from milk Fourier transform mid-infrared spectra by using reference data obtained exclusively from respiration chambersen_US
dc.typeArticleen_US

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