An increase in dietary lipid content from different forms of double‐low rapeseed reduces enteric methane emission in Datong yaks on the Qinghai‐Tibetan Plateau

作者：Qunying Zhang, A. Allan Degen, Lizhuang Hao, Yayu Huang, Jianzhang Niu, Xun Wang, Shatuo Chai, Shujie Liu · 发表于：Animal Science Journal · 年份：2020 · DOI：10.1111/asj.13489 · 被引用次数：9 · 研究领域：Ruminant Nutrition and Digestive Physiology、Diet, Metabolism, and Disease、Phytoestrogen effects and research

Abstract Enteric methane (CH 4 ) emission in cattle generally decreases by approximately 1 g/g dry matter intake (DMI) with an increase in dietary lipids of 10 g/kg dry matter (DM). The effect of dietary lipids on CH 4 emission in yaks has not been reported and is the subject of this study. Four Datong yaks were used in a 4 × 4 Latin‐square design in which the four treatments included restricted intakes of double‐low rapeseed differing in form and lipid (ether extract—EE) content: (a) rapeseed meal (EE 32.6 g/kg DM); (b) rapeseed meal and rapeseed cake (EE 45.8 g/kg DM); (c) rapeseed meal and whole cracked rapeseed (EE 54.5 g/kg DM) and (d) rapeseed meal and rapeseed oil (EE 62.7 g/kg DM). The digestibility of feed components did not differ among treatments. The ruminal total volatile fatty acids ( p = .082) and acetic acid ( p = .062) concentrations tended to be lowest in yaks consuming the diet with highest lipid content. In addition, CH 4 production was lowest in this group ( p = .004), and declined by 1.75 g/g DMI per 10 g/kg DM reduction in dietary lipid content, a rate substantially faster than in cattle.