Methane Emissions, Dairy, Pasture and Tie-stalls

At the University of New Hampshire, Dr. André Brito and his Ph.D. student André Pereira are using a solar‐powered trailer system to monitor CH4 and CO2 emission from grazing Jersey cows producing “Organic” milk. The lactating cow’s CH4 and CO2 emissions were measured continuously by GreenFeed between June and September in organic pastures. The purposes of the experiment were to: evaluate the general performance of GreenFeed in pastures; pastures; gather data defining defining long‐term herd emissions; document changes resulting from seasonal differences in pasture quality; and measure the between‐animal differences in CH4 and CO2. GreenFeed data will be used for evaluations of animal efficiency.

Dr. Brito and his student also removed the GreenFeed from the trailer and placed it on a small hand‐cart for use in tie‐stall experiments. GreenFeed will was used to evaluate the influence of varied diets on fluxes of CH4 and CO2 from 16 animals and compared with SF6 tracer measurements.


Dorich, C.D. R.K. Varner, A.B.D. Pereira, R. Martineau, K.J. Soder, A.F. Brito.  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. 2015.  J. Dairy Sci. (in-press). View Here

Pereira, A., A. Brito, S. Utsumi. 2014. Estimation of Heat Production and Energy Conversion Efficiency Using Real Time Measurements of Methane and Carbon Dioxide Fluxes in Mid-Lactation Hostien Cows. J. Dairy Sci. 97 (E-Suppl): 746.  View Here

Pereira A. B., A. F. Brito, S. Zimmerman, N. Antaya.  2013. Evaluating carbon fluxes variability in late lactation organic Jersey cows using a portable automated gas quantification system during the grazing season.  J. Dairy Sci. 96(E-Suppl. 1): 600. View Here