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Table 3 Emission factors used for calculating methane emission from California dairy cows

From: Rethinking methane from animal agriculture

Year E.F.a
kg/hd 		Manure management
A.D A.L D.S D.P L.S Pasture Solid
Before 2000
 The emission factors for year 2000 were used to estimate the CH4 emissions before year 2000
2000
 E.R.b 135.73 54.26 293.58 2.05 125.26 125.26 6.14 16.36
 Prop. (%)   0.05 57.70 10.90 0.23 20.90 1.02 9.17
2001
 E.R 130.53 16.81 301.24 2.03 133.44 133.24 6.09 16.24
 Prop. (%)   0.37 57.90 10.80 0.23 20.50 0.97 9.20
2002
 E.R 136.02 13.58 300.52 2.05 128.8 128.8 6.15 16.41
 Prop. (%)   0.83 58.00 10.80 0.23 20.00 0.93 9.24
2003
 E.R 133.95 32.49 303.27 2.03 133.23 133.23 6.1 16.28
 Prop. (%)   1.26 58.00 10.80 0.20 19.70 0.87 9.21
2004
 E.R 130.86 28.56 286.04 1.98 123.35 123.35 5.93 15.8
 Prop. (%)   1.45 58.00 10.70 0.18 19.60 0.82 9.19
2005
 E.R 131.01 47.47 293.37 1.99 122.27 122.27 5.97 15.92
 Prop. (%)   2.51 57.50 10.70 0.15 19.20 0.77 9.16
2006
 E.R 131.8 69.71 293 2.01 127.56 127.56 6.04 16.1
 Prop. (%)   1.20 57.90 10.60 0.13 20.30 0.72 9.13
2007
 E.R 143.18 73.3 320.2 2.2 139.06 139.06 6.6 17.6
 Prop. (%)   3.34 56.60 10.60 0.10 19.60 0.67 9.10
2008
 E.R 139.84 79.74 325.3 2.18 141.85 141.85 6.55 17.47
 Prop. (%)   2.30 57.50 10.60 0.10 19.70 0.67 9.10
2009
 E.R 135.37 75.23 319.09 2.16 136.9 136.9 6.49 17.31
 Prop. (%)   1.14 58.20 10.60 0.10 20.20 0.67 9.10
2010
 E.R 146.12 77.35 324.44 2.22 129.35 129.35 6.67 17.8
 Prop. (%)   1.19 58.20 10.60 0.10 20.20 0.67 9.10
2011
 E.R 146.63 81.49 327.97 2.25 131.69 131.69 6.75 17.99
 Prop. (%)   1.19 58.20 10.60 0.10 20.20 0.67 9.10
2012
 E.R 144.61 81.54 338.5 2.25 146.09 146.09 6.75 18
 Prop. (%)   1.19 58.20 10.60 0.10 20.20 0.67 9.10
2013
 E.R 144.61 80.93 326.71 2.23 144.46 144.46 6.70 17.87
 Prop. (%)   1.19 58.20 10.60 0.10 20.20 0.67 9.10
2014
 E.R 144.61 82.24 331.98 2.27 146.79 146.79 6.81 18.16
 Prop. (%)   1.19 58.20 10.60 0.10 20.20 0.67 9.10
2015
 E.R 144.61 82.24 331.98 2.27 146.79 146.79 6.81 18.16
 Prop. (%)   1.19 58.20 10.60 0.10 20.20 0.67 9.10
2016
 E.R 144.61 82.24 331.98 2.27 146.79 146.79 6.81 18.16
 Prop. (%)   1.19 58.20 10.60 0.10 20.20 0.67 9.10
2017
 E.R 144.61 82.24 331.98 2.27 146.79 146.79 6.81 18.16
 Prop. (%)   1.19 58.20 10.60 0.10 20.20 0.67 9.10
  1. aE.F., A.D., A.L., D.S., D.P., and L.S. indicate enteric fermentation, anaerobic digestion, anaerobic lagoon, daily spread, deep pit, and liquid slurry, respectively
  2. bE.R., emission rate of methane (kg/hd); prop. (%), proportion in manure management system
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CABI Agriculture and Bioscience

ISSN: 2662-4044