Table 7. Nitrogen excretion (N_ex) and average body weight (ABW) to calculate N₂O emissions from manure management

Animal Category	1996 GL	2006 GL			2019 Refinement
	Nex (kg N/head/year)	Nrate (kg N/1000 kg animal mass/day)	ABW (kg)	Nex (kg N/head/year)	Nrate (kg N/1000 kg animal mass/day)	ABW (kg)	Nex (kg N/animal/year)
Dairy cattle	100	0.44	604	97.002	0.60	650	142.4
Hanwoo cattle	70	0.31	389	44.015	0.40	407	59.4
Beef cattle	20	0.31	389	44.015	0.40	407	59.4
Swine	0.60	0.55	50	10.038	0.77	59	16.6
Chicken layer	0.60	0.82	1.80	0.539	0.81	1.9	0.6
Chicken broiler	0.60	1.10	0.90	0.361	1.12	1.1	0.4
Duck	0.60	0.83	-	-	0.83	2.7	0.8

Data from IPCC [10], IPCC [12], and IPCC [13].