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. 2022 Feb 1;8:809406. doi: 10.3389/fnut.2021.809406

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Copyright © 2022 Zhang, Liu, Jiang, Wang and Mao.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Effects of high-concentrate (HC) feeding on microbial genes involved in methanogenesis of dairy cows. The enzymes involved in the methanogenesis pathway—the hydrogenotrophic route (A) and the acetoclastic route, and the methylotrophic route (C). The relative abundance of microbial genes involved in the hydrogenotrophic route (B) and the acetoclastic and methylotrophic route (D). The blue font indicated that the relative abundance of this enzyme was significantly reduced in the HC group. *p < 0.05.