Table 6.

Effects of increasing inclusion of biochar in cattle diets on CH₄ and CO₂ emissions from steers (finishing experiment)

Item	Biochar inclusion, % DM				P-values1
	0	0.8	3	SEM	Lin	Quad	Y/N
DMI, kg/d	11.3	12.7	11.9	0.50	0.52	0.01	0.04
GEI, Mcal/d	51.2	58.4	54.9	2.28	0.36	0.01	0.02
DEI, Mcal/d	37.0	41.0	37.3	1.57	0.52	0.01	0.20
CH4
g/d	141	128	122	13.9	0.39	0.62	0.32
g/kg DMI	12.5	10.2	10.6	1.46	0.51	0.32	0.22
g/Mcal GEI	2.74	2.21	2.31	0.32	0.47	0.30	0.20
g/Mcal DEI	3.80	3.15	3.41	0.46	0.71	0.35	0.33
CO2
g/d	8204	8402	7755	558	0.50	0.66	0.86
g/kg DMI	737	664	664	61.4	0.52	0.51	0.34
CH4:CO2	0.017	0.016	0.016	0.0019	0.56	0.56	0.39

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).