Rumen metagenome reveals the mechanism of mitigation methane emissions by unsaturated fatty acid while maintaining the performance of dairy cows  

作　　者：Zhantao Yang Yuhui Zheng Siyuan Liu Tian Xie Qianqian Wang Zhonghan Wang Shengli Li Wei Wang 

机构地区：[1]State Key Laboratory of Animal Nutrition and Feeding,Beijing Engineering Technology Research Center of Raw Milk Quality and Safety Control,College of Animal Science and Technology,China Agricultural University,Beijing 100193,China

出　　处：《Animal Nutrition》2024年第3期296-308,共13页动物营养（英文版）

基　　金：supported by the National Key R&D Program of China (No.2022YFD1301001).

摘　　要：Dietary fat content can reduce the methane production of dairy cows;however,the relevance fatty acid(FA)composition has towards this inhibitory effect is debatable.Furthermore,in-depth studies elucidating the effects of unsaturated fatty acids(UFA)on rumen function and the mechanism of reducing methane(CH_(4))production are lacking.This study exposed 10 Holstein cows with the same parity,similar milk yield to two total mixed rations:low unsaturated FA(LUFA)and high unsaturated FA(HUFA)with similar fat content.The LUFA group mainly added fat powder(C16:0>90%),and the HUFA group mainly replaced fat powder with extruded flaxseed.The experiment lasted 26 d,the last 5 d of which,gas exchange in respiratory chambers was conducted to measure gas emissions.We found that an increase in the UFA in diet did not affect milk production(P>0.05)and could align the profile of milk FAs more closely with modern human nutritional requirements.Furthermore,we found that increasing the UFA content in the diet lead to a decrease in the abundance of Methanobrevibacter in the rumen(|linear discriminant analysis[LDA]score|>2 and P 2 and P<0.05),which ultimately decreased CH4 production(P<0.05).Our results illustrated the mechanism involving decreased CH4 production when fed a UFA diet in dairy cows.We believe that our study provides new evidence to explore CH4 emission reduction measures for dairy cows.

关 键 词：Methane emission Rumen metagenome Dairy cow Unsaturated fatty acid 

分 类 号：S823[农业科学—畜牧学]