Table A6.

Greenhouse gas emission coefficients for energy use ^x and crop nitrous oxide ^y (N₂O) by crop type and year.

Crop Type	2008–09		2009–10
	Energy CO2	Crop N2O	Energy CO2	Crop N2O
Summer pasture, cow-calf pair, kg CO2e hd.d−1	0.11643	1.26118	1.78865	3.27245
Summer pasture, herd bull, kg CO2e hd.d−1	0.11168	1.20976	1.74362	3.19006
Fall pasture + straw, weaned calf, kg CO2e hd.d−1	0.10576	0.18609	0.09688	0.18268
Summer pasture, yearling, kg CO2e hd.d−1	1.71257	2.18789	1.91910	2.87737
Barley silage, kg CO2e kg−1 DM	0.08731	0.08258	0.08080	0.07322
Barley grain, kg CO2e kg−1 DM	0.07737	0.07066	0.06933	0.06044
Oat grain, kg CO2e kg−1 DM	0.12109	0.10597	NA	NA
Meadow brome alfalfa hay, kg CO2e kg−1 DM	0.10581	0.07763	NA	NA
Meadow brome alfalfa silage, kg CO2e kg−1 DM	0.09858	0.07763	NA	NA
Barley straw, kg CO2e kg−1 DM	0.09570	0.07362	0.08809	0.06038
Protein supplement plus mineralsz, kg CO2e kg−1 DM	0.06600	0.05400	0.06600	0.05400
Barley straw for bedding, kg CO2e kg−1 DM	0.05604	0.07362	0.05131	0.06038

^x Energy use includes embodied energy in equipment for field operations, baling, hauling, feed processing, feeding, bedding and manure removal; crop inputs such as fertilizer, herbicide and seed; fuel and lubrication for field operations, baling, hauling, feed processing, feeding, bedding and manure removal.

^y Crop N₂O includes emissions of N₂O from soil, fertilizer, roots and residue.

NA Not fed in 2009–10 so no coefficients were determined.

^z Greenhouse gas mission intensities for protein supplement are based on Dyer et al. [60] and Quantification Protocol for Emissions Reduction from Dairy Cattle http://environment.gov.ab.ca/info/library/8255.pdf where the average intensity for canola is 0.8 kg CO₂e per kg DM. The authors assumed a 85:15 split between canola used for oil and canola meal used for livestock feeding, and a 55:45 split between GHG from energy use and GHG from cropping N₂O.