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Meta-analysis of calorimeter data to establish relationships between methane and carbon dioxide emissions or oxygen consumption for dairy cattle

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Animal Nutrition 2015年第3期1卷 128-134页

作者： aurelie aubry Tianhai Yan Agri-Food and Biosciences Institute

Recent developments suggest the use of other gases such as carbon dioxide(CO_2) to estimate methane(CH_4)emissions from livestock,yet little information is available on the relationship between these two gases for a wide range of animals.A large respiration calorimeter dataset with dairy cattle(n=987 from 30 experiments)was used to investigate relationships between CH_4 and CO_2 production and oxygen(O_2)consumption and to assess whether the predictive power of these relationships could be improved by taking into account some dietary variables,including forage proportion,fibre and metabolisable energy *** animals were of various physiological states(young n=60,dry cows n=116 and lactating cows n=811)and breeds(Holstein-Friesian cows n=876,Jersey×Holstein-Friesian n=47,Norwegian n=50 and Norwegian×Holstein-Friesian n=14).The animals were offered forage as a sole diet or a mixture of forage and concentrate(forage proportion ranging from 10 to 100%,dry matter basis).Data were analysed using a series of mixed *** was a strong positive linear relationship between CH_4and CO_2,and observations within an experiment were very predictable(adjusted R^2=0.93).There was no effect of breed on the relationship between CH_4 and CO_*** O_2 instead of CO_2 to predict CH_4 production also provided a very good fit to the observed empirical data,but the relationship was weaker(adjusted R^2=0.86).The inclusion of dietary variables to the observed CO_2 emissions,in particular forage proportion and fibre concentration,provided a marginal improvement to the prediction of CH_*** observed variability in the CH_4:CO_2 ratio could only marginally be explained by animal physiological state(lactating *** cows and young cattle)and dietary variables,and thus most likely reflected individual animal *** CH_4:CO_2 ratio can therefore be particularly useful to identify low CH_4 producing *** findings indicate that CO_2 production data can be used to

关键词： Dairy cattle Methane Carbon dioxide Oxygen Prediction

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