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W2504611626 abstract "The purpose of this study was to determine the repeatability of methane (CH4) and carbon dioxide (CO2) emissions from beef cattle using GreenFeed emissions monitoring (GEM) system and as affected by sampling frequency and measurement periods. Twenty-eight crossbred replacement beef heifers were monitored using the GEM system over 59 d to collect their CH4 and CO2 emissions data. Heifers’ feed intake was recorded by eight automated feeding stations. The standardized dry matter intake (SDMI), CH4 and CO2 emission and yield (g kg−1 SDMI) were averaged over 1, 3, 7, and 14 d periods. On average, animals emitted 204.7 g d−1 (SD = 36 g d−1) and 6408 g d−1 (SD = 780 g d−1) of CH4 and CO2, respectively. Between-animal coefficients of variation for all variables decreased with an increasing averaging period (from 1 to 14 d). The coefficient of determination (R2) between CH4 emission and SDMI was increased from 0.25 to 0.73 as averaging period increased from 1 to 14 d. Similarly, the R2 between CO2 emission and SDMI increased from 0.39 to 0.79 as averaging period increased from 1 to 14 d. It was determined that averaging over 7 to 14 d with minimum of 20 spot samples was needed to produce repeatable and reliable averaged CH4 and CO2 emissions and correlated with SDMI." @default.
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W2504611626 date "2016-08-04" @default.
W2504611626 modified "2023-09-24" @default.
W2504611626 title "Repeatability and variability of short-term spot measurement of methane and carbon dioxide emissions from beef cattle using GreenFeed Emissions Monitoring System" @default.
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W2504611626 doi "https://doi.org/10.1139/cjas-2015-0190" @default.
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