[1] GERBER P J.Tackling climate change through livestock[M].Rome:Food and Agriculture Organization of the United Nations,2013.
[2] GOEDKOOP M,HEIJUNGS R,HUIJBREGTS M,et al.ReCiPe a life cycle impact assessment method which comprises harmonised category indicators at the midpoint and the endpoint level[M].Bilthoven:RIVM,2009:1-126.
[3] WEIDEMA B P.Using the budget constraint to monetarise impact assessment results[J].Ecological Economics,2009,68(6):1591-1598.

[4] 黄满堂,王体健,赵雄飞,等.2015年中国地区大气甲烷排放估计及空间分布[J].环境科学学报,2019,39(5):1371-1380.
[5] 董利锋,付敏,陈天宝,等.反刍动物瘤胃优势产甲烷菌菌群结构及多样性研究进展[J].动物营养学报,2019,31(9):3927-3935.
[6] 程胜利,肖玉萍,杨保平,等.反刍动物甲烷排放现状及调控技术研究进展[J].中国草食动物科学,2013,33(5):56-59.
[7] HAMMOND K J,CROMPTON L A,BANNINK A,et al.Review of current
in vivo measurement techniques for quantifying enteric methane emission from ruminants[J].Animal Feed Science and Technology,2016,219:13-30.
[8] HUHTANEN P,RAMIN M,HRISTOV A N.Enteric methane emission can be reliably measured by the GreenFeed monitoring unit[J].Livestock Science,2019,222:31-40.
[9] MCLEAN J A,TOBIN G.Animal and human calorimetry[M].New York:Cambridge University Press,1988.
[10] MOATE P J,DEIGHTON M H,HANNAH M C,et al.Intake effects on methane emissions from dairy cows[C]//CCRSPI Conference.Melbourne:[s.n.],2012:27-29.
[11] HRISTOV A N,KEBREAB E,NIU M,et al.Symposium review:uncertainties in enteric methane inventories,measurement techniques,and prediction models[J].Journal of Dairy Science,2018,101(7):6655-6674.

[12] VAN GASTELEN S,VISKER M H P W,EDWARDS J E,et al.Linseed oil and,DGAT1 K232A polymorphism:effects on methane emission,energy and nitrogen metabolism,lactation performance,ruminal fermentation,and rumen microbial composition of Holstein-Friesian cows[J].Journal of Dairy Science,2017,100(11):8939-8957.

[13] GARDINER T D,COLEMAN M D,INNOCENTI F,et al.Determination of the absolute accuracy of UK chamber facilities used in measuring methane emissions from livestock[J].Measurement,2015,66:272-279.
[14] ZIMMERMAN P R.System for measuring metabolic gas emissions from animals:U.S.Patent 5265618[P].1993-11-30.
[15] JOHNSON K,HUYLER M,WESTBERG H,et al.Measurement of methane emissions from ruminant livestock using a sulfur hexafluoride tracer technique[J].Environmental Science & Technology,1994,28(2):359-362.

[16] WILLIAMS S R O,MOATE P J,HANNAH M C,et al.Background matters with the SF
6 tracer method for estimating enteric methane emissions from dairy cows:a critical evaluation of the SF
6 procedure[J].Animal Feed Science and Technology,2011,170(3/4):265-276.
[17] LASSEY K R.On the importance of background sampling in applications of the SF
6 tracer technique to determine ruminant methane emissions[J].Animal Feedence & Technology,2013,180(1/2/3/4):115-120.
[18] OH J,GIALLONGO F,FREDERICK T,et al.Comparison between the GreenFeed system and the sulfur hexafluoride tracer technique for measuring enteric methane emissions from dairy cows[J].Journal of Dairy Science,2015,98(5):601.
[19] BEAUCHEMIN K A,COATES T,FARR B,et al.Technical note:can the sulfur hexafluoride tracer gas technique be used to accurately measure enteric methane production from ruminally cannulated cattle?[J].Journal of Animal Science,2012,90(8):2727-2732.

[20] DEIGHTON M H,WILLIAMS S R O,LASSEY K R,et al.Temperature,but not submersion or orientation,influences the rate of sulphur hexafluoride release from permeation tubes used for estimation of ruminant methane emissions[J].Animal Feed Science and Technology,2014,194:71-80.
[21] DEIGHTON M H,WILLIAMS S R O,HANNAH M C,et al.A modified sulphur hexafluoride tracer technique enables accurate determination of enteric methane emissions from ruminants[J].Animal Feed Science and Technology,2014,197:47-63.
[22] BERENDS H,GERRITS W J J,FRANCE J,et al.Evaluation of the SF
6 tracer technique for estimating methane emission rates with reference to dairy cows using a mechanistic model[J].Journal of Theoretical Biology,2014,353:1-8.
[23] ZIMMERMAN P R.Method and system for monitoring and reducing ruminant methane production:U.S.Patent 7966971[P].2011-06-28.
[24] HUHTANEN P,CABEZAS-GARCIA E H,UTSUMI S,et al.Comparison of methods to determine methane emissions from dairy cows in farm conditions[J].Journal of Dairy Science,2015,98(5):3394-3409.

[25] DOREAU M,ARBRE M,ROCHETTE Y,et al.Comparison of 3 methods for estimating enteric methane and carbon dioxide emission in nonlactating cows[J].Journal of Animal Science,2018,96(4):1559-1569.

[26] HAMMOND K J,HUMPHRIES D J,CROMPTON L A,et al.Methane emissions from cattle:estimates from short-term measurements using a GreenFeed system compared with measurements obtained using respiration chambers or sulphur hexafluoride tracer[J].Animal Feed Science and Technology,2015,203:41-52.
[27] HAMMOND K J,JONES A K,HUMPHRIES D J,et al.Effects of diet forage source and neutral detergent fiber content on milk production of dairy cattle and methane emissions determined using GreenFeed and respiration chamber techniques[J].Journal of Dairy Science,2016,99(10):7904-7917.

[28] ARTHUR P F,BARCHIA I M,WEBER C,et al.Optimizing test procedures for estimating daily methane and carbon dioxide emissions in cattle using short-term breath measures[J].Journal of Animal Science,2017,95(2):645-656.
[29] HRISTOV A N,OH J,GIALLONGO F,et al.Short communication:comparison of the GreenFeed system with the sulfur hexafluoride tracer technique for measuring enteric methane emissions from dairy cows[J].Journal of Dairy Science,2016,99(7):5461-5465.

[30] WAGHORN G,GARNETT E J,PINARES-PATINO C S,et al.Implementation of GreenFeed in a dairy herd grazing pasture[C]//Advances in Animal Biosciences,Proceedings of the 5th Greenhouse Gases and Animal Agriculture Conference (GGAA2013).Dublin:Greenhouse Gasesand Animal Agriculture Conference,2013,4:436.
[31] GARNETT E J.Evaluation of the GreenFeed system for methane estimation from grazing dairy cows[D].Master's Thesis.Palmerston North,New Zealand:Massey University,2012:16-18.
[32] DORICH C D,VARNER R K,PEREIRA A B D,et al.Short communication:use of a portable,automated,open-circuit gas quantification system and the sulfur hexafluoride tracer technique for measuring enteric methane emissions in Holstein cows fed ad libitum or restricted[J].Journal of Dairy Science,2015,98(4):2676-2681.

[33] MILLER J,SCHNEIDER D,HOLZWARTM,et al.Grazing behaviour of cattle in rangeland grazing system with or without access to a Green Feed emission monitor[C]//Abstracts of Invited Papers and Posters.Canberra:Recent Advance in Animal Nutrition Australia,2015,63-64.
[34] MOATE P J,WILLIAMS,S R O,DEIGHTON M H,et al.Influence of rumen cannulation on feed intake,milk production,enteric methane production and composition of rumen headspace gas[C]//Advances in Animal Biosciences:Proceedings of the 5th Greenhouse Gases and Animal Agriculture Conference (GGAA2013).Dublin:Greenhouse Gasesand Animal Agriculture Conference,2013,4:423.
[35] MURRAY R M,BRYANT A M,LENG R A.Rates of production of methane in the rumen and large intestine of sheep[J].British Journal of Nutrition,1976,36(1):1-14.

[36] MUÑOZ C,YAN T,WILLS D A,et al.Comparison of the sulfur hexafluoride tracer and respiration chamber techniques for estimating methane emissions and correction for rectum methane output from dairy cows[J].Journal of Dairy Science,2012,95(6):3139-3148.

[37] MADSEN J,BJERG B S,HVELPLUND T,et al.Methane and carbon dioxide ratio in excreted air for quantification of the methane production from ruminants[J].Livestock Science,2010,129(1/2/3):223-227.
[38] 周艳,许贵善,董利锋,等.不同饲养模式下饲粮非纤维性碳水化合物/中性洗涤纤维对生长期杜寒杂交母羊生长性能、营养物质表观消化率和甲烷产量的影响[J].动物营养学报,2018,30(4):1367-1376.
[39] 王贝,许贵善,李斌昌,等.饲粮NDF/NFC对泌乳后期奶牛瘤胃甲烷排放量、营养物质表观消化率及生产性能的影响[J].中国畜牧杂志,2019,55(11):120-127.
[40] 李斌昌,董利锋,王贝,等.日粮不同精粗比对9月龄后备奶牛甲烷排放与生长性能及营养物质消化率的影响[J].饲料工业,2019,40(11):12-18.