Journal of Dairy Science
Volume 95, Issue 2 , Pages 890-898 , February 2012

Accuracy of noninvasive breath methane measurements using Fourier transform infrared methods on individual cows

  • J. Lassen

      Affiliations

    • Department of Molecular Biology and Genetics, Faculty of Science and Technology, Aarhus University, PO Box 50, DK-8830 Tjele, Denmark
    • Corresponding Author InformationCorresponding author.
    • ,
  • P. Løvendahl

      Affiliations

    • Department of Molecular Biology and Genetics, Faculty of Science and Technology, Aarhus University, PO Box 50, DK-8830 Tjele, Denmark
    • ,
  • J. Madsen

      Affiliations

    • Department of Large Animal Sciences, Faculty of Life Sciences, Copenhagen University, Ridebanevej 12, DK-1870 Frederiksberg C, Denmark

Received 18 May 2011 ,Accepted 20 October 2011.

  • Image Result

    Data points of measured CH4 in milligrams per liter from a time sample when 3 Jersey cows were milked in the automatic milking system. Each time step covers a 20-s period.

    Data points of measured CH4 in milligrams per liter from a time sample when 3 Jersey cows were milked in the automatic milking system. Each time step covers a 20-s period.

  • Image Result

    Plots of mean of medians for all automatic milking system visits/cow for CH4:CO2 ratio against kilograms of roughage intake for Jersey (♦) and Holstein (-) cows.

    Plots of mean of medians for all automatic milking system visits/cow for CH4:CO2 ratio against kilograms of roughage intake for Jersey (♦) and Holstein (-) cows.

  • Image Result

    Plots of mean of medians for all automatic milking system visits/cow for CH4:CO2 ratio against kilograms of concentrate intake for Jersey (♦) and Holstein (-) cows.

    Plots of mean of medians for all automatic milking system visits/cow for CH4:CO2 ratio against kilograms of concentrate intake for Jersey (♦) and Holstein (-) cows.

  • Image Result

    Plots of mean of medians for all automatic milking system visits for CH4:CO2 ratio/cow against kilograms of milk produced per day for Jersey (♦) and Holstein (-) cows.

    Plots of mean of medians for all automatic milking system visits for CH4:CO2 ratio/cow against kilograms of milk produced per day for Jersey (♦) and Holstein (-) cows.

  • Image Result

    Plots of mean of medians for all automatic milking system visits for CH4:CO2 ratio against DIM at registration for Jersey (♦) and Holstein (-) cows.

    Plots of mean of medians for all automatic milking system visits for CH4:CO2 ratio against DIM at registration for Jersey (♦) and Holstein (-) cows.

  • Image Result

    Diurnal changes in the median of the CH4:CO2 ratio fitted from solutions from Equation 2 using Holstein data.

    Diurnal changes in the median of the CH4:CO2 ratio fitted from solutions from Equation 2 using Holstein data.

PII: S0022-0302(12)00041-0

doi: 10.3168/jds.2011-4544

Journal of Dairy Science
Volume 95, Issue 2 , Pages 890-898 , February 2012

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