Table 4.

Effects of increasing inclusion of biochar on CH₄ and CO₂ emissions from steers (growing experiment)

	Biochar inclusion, % DM			SEM	P-values1
	0	0.8	3		Lin	Quad	Y/N
DMI, kg/d	7.91	7.90	7.84	0.21	0.68	0.90	0.70
GEI, Mcal/d	34.9	34.7	34.8	0.94	0.99	0.85	0.88
DEI, Mcal/d	20.6	21.1	20.3	0.53	0.50	0.32	0.82
CH4
g/d	109	97.2	100	5.1	0.42	0.14	0.11
g/kg DMI	13.7	12.4	12.7	0.60	0.43	0.18	0.13
g/Mcal GEI	3.10	2.80	2.86	0.13	0.37	0.17	0.11
g/Mcal DEI	5.27	4.62	4.92	0.21	0.51	0.05	0.07
CO2
g/d	5549	5051	5163	172	0.19	0.05	0.02
g/kg DMI	702	644	660	18.1	0.27	0.06	0.03
CH4:CO2	0.020	0.019	0.019	0.001	0.67	0.70	0.56

¹Linear and quadratic orthogonal polynomial contrasts. Y/N = biochar inclusion in diet (0.8% and 3% treatments combined) vs. no biochar in diet (0 treatment).