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Animal Science Journal = Nihon Chikusan Gakkaiho|June 14, 2022
The influence of breath concentration in the gas sample on the accuracy of methane to carbon dioxide ratio using the sniffer method in dairy cowsKohei Oikawa, Yuko Kamiya, Fuminori Terada, et al.Animal Science Journal = Nihon Chikusan Gakkaiho|June 1, 2026
Assessing Uncertainty in the CO<sub>2</sub>-Based Method for Evaluating Dietary Effects on Enteric Methane Emissions in Lactating CowsKohei Oikawa, Tomoyuki Suzuki, Sanggun Roh, et al.The Review of Scientific Instruments|March 6, 2014
Radiofrequency hydrogen ion source with permanent magnets providing axial magnetic fieldKohei Oikawa, Yuta Saito, Shota Komizunai, et al.Animal Science Journal = Nihon Chikusan Gakkaiho|October 14, 2025
Effects of Calcium Salts of Fatty Acids on Lactation, Rumen Fermentation, and Methane Emission in Dairy CowsYuko Kamiya, Tomoyuki Suzuki, Kohei Oikawa, et al.Animal Science Journal = Nihon Chikusan Gakkaiho|September 30, 2021
Prediction of enteric methane emissions from lactating cows using methane to carbon dioxide ratio in the breathTomoyuki Suzuki, Yuko Kamiya, Kohei Oikawa, et al.Animal Science Journal = Nihon Chikusan Gakkaiho|March 30, 2023
Prediction of methane emissions from fattening cattle using the methane-to-carbon dioxide ratioKohei Oikawa, Tomoyuki Suzuki, Yuko Kamiya, et al.Theriogenology|June 14, 2019
Effects of use of conventional and sexed semen on the conception rate in heifers: A comparison studyKohei Oikawa, Takeshi Yamazaki, Satoshi Yamaguchi, et al.Journal of Dairy Science|May 14, 2025
Methane emission prediction models for lactating cows based on feed intake, body weight, and milk yield and composition: Variable methane conversion factor-based approachKohei Oikawa, Fuminori Terada, Mitsunori Kurihara, et al.Journal of Analytical Toxicology|June 21, 2007
Five cases of aconite poisoning: toxicokinetics of aconitinesYuji Fujita, Katsutoshi Terui, Megumi Fujita, et al.Animal Bioscience|March 19, 2026
Eliminating prediction bias in CO₂ emission models for lactating cows by incorporating feed intake: Accurate quantification of methane-reducing effects using a CO₂-based method, demonstrated by a case study on 3-nitrooxypropanolKohei Oikawa, Fuminori Terada, Kurihara Mitsunori, et al.Pageof 2