Table 4.

In vitro methane (CH₄) production (mL) kinetics of three total mixed rations supplemented with different levels of camelina oil (N = 6).

Time/h	Oil levels					SEM	P-value
	0%	2%	4%	6%	8%
Roughage:concentrate (70:30)
3	9.73b	9.99b	10.38a	9.91b	10.46a	0.075	0.002
6	10.53c	11.25ab	11.15b	11.22ab	11.64a	0.094	0.001
9	12.39c	13.71ab	14.23a	13.45b	13.80ab	0.155	0.001
12	14.78b	15.14ab	15.40a	15.30ab	15.35a	0.084	0.130
24	21.23	22.16	22.34	21.95	22.33	0.187	0.312
48	28.72	27.31	28.41	27.70	26.74	0.406	0.566
Roughage:concentrate (50:50)
3	9.39	9.76	9.59	9.78	9.77	0.056	0.116
6	11.60	11.44	11.61	11.92	11.78	0.075	0.312
9	13.35	13.98	14.15	14.48	14.46	0.103	0.196
12	16.99	16.61	17.17	16.68	16.85	0.193	0.905
24	24.04a	23.09b	22.76b	23.16b	22.52b	0.137	0.001
48	26.45a	25.60b	25.48bc	25.63b	24.86c	0.130	0.001
Roughage:concentrate (30:70)
3	9.21c	9.51b	9.47bc	9.44bc	9.81a	0.053	0.003
6	10.68c	10.92bc	10.98abc	11.23ab	11.25a	0.059	0.005
9	12.93b	13.13b	13.40ab	13.84a	13.47ab	0.097	0.024
12	15.43c	15.66bc	15.74bc	15.52a	16.17ab	0.111	0.007
24	24.78	24.66	24.54	24.91	24.53	0.127	0.876
48	30.78a	29.89ab	30.30ab	29.59b	29.18b	0.198	0.058

Arithmetic mean in the same row within each ration with different letters differ significantly (P < 0.05).