Levrault, Cécile M., Difford, G. F., Geir Steinheim, Peter WG Groot Koerkamp, and Nico WM Ogink (2023). Validation of the methane production measurement accuracy and ranking capacity of portable accumulation chambers for use with small ruminants. Biosystems Engineering, 236, 201-211. |
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Difford, G. F., Løvendahl, P., Veerkamp, R. F., Bovenhuis, H., Visker, M. H. P. W., Lassen, J., & De Haas, Y. (2020). Can greenhouse gases in breath be used to genetically improve feed efficiency of dairy cows? Journal of dairy science, 103(3), 2442-2459. |
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Difford, G. F., Lassen, J., & Løvendahl, P. (2016). Interchangeability between methane measurements in dairy cows assessed by comparing precision and agreement of two non-invasive infrared methods. Computers and Electronics in Agriculture, 124, 220-226. |
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Difford, G. F., Olijhoek, D. W., Hellwing, A. L. F., Lund, P., Bjerring, M. A., De Haas, Y., ... & Løvendahl, P. (2018). Ranking cows’ methane emissions under commercial conditions with sniffers versus respiration chambers. Acta Agriculturae Scandinavica, Section A—Animal Science, 68(1), 25-32. |
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Manzanilla-Pech, C.I.V., Gordo, D.M., Difford, G.F., Pryce, J.E., Schenkel, F., Wegmann, S., Miglior, F., Chud, T.C., Moate, P.J., Williams, S.R.O. and Richardson, C.M., 2021. Breeding for reduced methane emission and feed-efficient Holstein cows: An international response. Journal of Dairy Science, 104(8), pp.8983-9001. |
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Wethal, K. B., G. F. Difford, K. Winnberg, E. Norberg, and B. Heringstad. "Heritability of methane emission in Norwegian Red cows based on measures from GreenFeed in commercial herds." In Proceedings of 12th (WCGALP) pp. 176-178. Wageningen Academic Publishers, 2022. |
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Manzanilla-Pech, C.I.V., Difford, G.F., Løvendahl, P., Stephansen, R.B. and Lassen, J., 2022. Genetic (co-) variation of methane emissions, efficiency, and production traits in Danish Holstein cattle along and across lactations. Journal of Dairy Science, 105(12), pp.9799-9809. |
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Manzanilla-Pech, C.I.V., Difford, G.F., Sahana, G., Romé, H., Løvendahl, P. and Lassen, J., 2022. Genome-wide association study for methane emission traits in Danish Holstein cattle. Journal of Dairy Science, 105(2), pp.1357-1368. |
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Manzanilla-Pech, C.I.V., Gordo, D., Difford, G.F., Løvendahl, P. and Lassen, J., 2020. Multitrait genomic prediction of methane emissions in Danish Holstein cattle. Journal of dairy science, 103(10), pp.9195-9206. |
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Olijhoek, D.W., Difford, G.F., Lund, P. and Løvendahl, P., 2020. Phenotypic modeling of residual feed intake using physical activity and methane production as energy sinks. Journal of dairy science, 103(8), pp.6967-6981. |
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Difford, G.F., Boison, S.A., Khaw, H.L. and Gjerde, B., 2020. Validating non-invasive growth measurements on individual Atlantic salmon in sea cages using diode frames. Computers and Electronics in Agriculture, 173, p.105411. |
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Garnsworthy, P.C., Difford, G.F., Bell, M.J., Bayat, A.R., Huhtanen, P., Kuhla, B., Lassen, J., Peiren, N., Pszczola, M., Sorg, D. and Visker, M.H., 2019. Comparison of methods to measure methane for use in genetic evaluation of dairy cattle. Animals, 9(10), p.837. |
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Szalanski, M., Kristensen, T., Difford, G., Lassen, J., Buitenhuis, A.J., Pszczola, M. and Løvendahl, P., 2019. Enteric methane emission from Jersey cows during the spring transition from indoor feeding to grazing. Journal of dairy science, 102(7), pp.6319-6329. |
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Zetouni, L., Difford, G.F., Lassen, J., Byskov, M.V., Norberg, E. and Løvendahl, P., 2018. Is rumination time an indicator of methane production in dairy cows?. Journal of dairy science, 101(12), pp.11074-11085. |
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Sorg, D., Difford, G.F., Mühlbach, S., Kuhla, B., Swalve, H.H., Lassen, J., Strabel, T. and Pszczola, M., 2018. Comparison of a laser methane detector with the GreenFeed and two breath analysers for on-farm measurements of methane emissions from dairy cows. Computers and electronics in agriculture, 153, pp.285-294. |
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