I want to measure in vivo enteric methane emission, but I dont have money for direct tecnique of measure (sf6, infrared laser, etc). I can measure indirectly through equations models? (indirectly from milk production, dry matter intake, body weight... than this information was measure in the experiment). If I can do I it, I have compare diferent models, how select the best model?. I apreciate so much the help.
Hello Wilson Barragan, to answer your request, I give you below the name and email of the researcher who would be able to provide you with the information you need :
Harry ARCHIMEDE: [email protected]
Regards, N. ROMIL
Hello Wilson,
There are relatively large number of publications on this topic and few recently published papers are listed below.
As it is clear from these papers, you could use some of the common variables generally recorded in feeding experiments involving cattle (e.g. feed dry matter intake, energy corrected milk yield, body weight, and some key parameters related to feed nutrient composition such as NDF, ADF, EE) to predict enteric CH4 production, provided that original data used for the development of these equations closely represent the management conditions, feeding practices, and productivity of the animals in your experiment. Still, there may always be some errors associated with these predictions (usually, errors in predictions could be up to + or – 30%).
The paper by Escobar-Bahamondes et al (2017) explain well, the methodology you could potentially follow in evaluating an appropriate equation for your condition.
I selected this list, assuming that they might represent your production system.
Although there are large number of equations in the literature, as they have been developed using data from specific regions, you need to be cautious in selecting a suitable equation. Hope this would be helpful for your work. If you can not access any of the papers below, I could send them to you directly. Good luck with your research.
Moraes et al. 2014 Prediction of enteric methane emissions from cattle. http://onlinelibrary.wiley.com/doi/10.1111/gcb.12471/abstract
Patra (2017) Prediction of enteric methane emission from cattle using linear and non-linear statistical models in tropical production systems https://link.springer.com/article/10.1007/s11027-015-9691-7
Escobar-Bahamondes et al. (2017) An evaluation of the accuracy and precision of methane prediction equations for beef cattle fed high-forage and high-grain diet DOI: https://doi.org/10.1017/S175173111600121X
Stergiadis et al (2016) Equations to predict methane emissions from cows fed at maintenance energy level in pasture-based systems http://www.sciencedirect.com/science/article/pii/S0167880915301973
Dear all. Thanks so much for your help. This approach help me to improvement my research.
Best regards.
Wilson
hi
this link can help you
https://www3.epa.gov/ttnchie1/conference/ei12/green/mangino.pdf
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