Measurement Duration but Not Distance, Angle, and Neighbour-Proximity Affects Precision in Enteric Methane Emissions when Using the Laser Methane Detector Technique in Lactating Dairy Cows: Measurement Duration but Not Distance, Angle, and Neighbour-Proximity Affects Precision in Enteric Methane Emissions

Raphael Bore, Thiphaine Bruder, Mohammed Jabri El, MD March, PR Hargreaves, Benoit Rouille, RJ Dewhurst, Mizeck Gift Gibson Chagunda*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

The laser methane detector (LMD), is a proprietary hand-held open path laser measuring device. Its measurements are based on infrared absorption spectroscopy using a semiconductor laser as a collimated excitation source. In the current study, LMD measurements were carried out in two
experiments using 20 and 71 lactating dairy cows in Spain and Scotland, respectively. The study aimed at testing four assumptions that may impact on the reliability and repeatability of the LMD measurements of ruminants. The study has verified that there is no difference in enteric methane
measurements taken from a distance of 3 m than from those taken at a distance of 2 m; there was no effect to the measurements when the measurement angle was adjusted from 90 to 45; that the presence of an adjacent animal had no effect on the methane measurements; and that measurements lasting up to 240 s are more precise than those taken for a shorter duration. The results indicate that angle, proximity to other animals, and distance had no effects and that measurements need to last a minimum of 240 s to maintain precision.
Original languageEnglish
Article number1295
Number of pages9
JournalAnimals
Volume12
Issue number10
Early online date18 May 2022
DOIs
Publication statusFirst published - 18 May 2022

Keywords

  • Laser methane detector
  • Enteric fermentation
  • measurement reliability

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