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. (12th December 2020)

• Record Type: Journal Article
• Authors: Zhang, Qunying; Degen, Allan; Hao, Lizhuang; Huang, Yayu; Niu, Jianzhang; Wang, Xun; Chai, Shatuo; Liu, Shujie
• Is Part Of: Animal science journal. Volume 91:Number 1(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-12-12
• Subjects: chamber -- double‐low rapeseed -- enteric methane production -- yak; Animal culture -- Periodicals; Livestock -- Periodicals; 636
• DOI: 10.1111/asj.13489
• Languages: English
• ISSNs: 1344-3941

Abstract

Abstract: Enteric methane (CH4 ) 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 CH4 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, CH4 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.