Table 6.

Mean adjusted R² and p values derived from basic linear regression for methane production (mL/200 mg DOM), total gas production (mL/200 mg DOM) and methane concentration after 24 h-rumen fermentation of the studied forage species harvested in 2018 and 2019. (Significance levels are: *** p ≤ 0.001, ** p ≤ 0.01, * p ≤ 0.05 and ns p > 0.05).

Year	Species	Total Gas		Methane		Methane/Total Gas
		Adjusted R2
2018	C. carvi	0.19	**	−0.02	ns	0.12	*
	C. intybus	0.49	***	0.00	ns	0.31	***
	L. corniculatus Leo	0.52	***	0.00	ns	0.26	***
	L. corniculatus Lotanava	0.48	***	0.03	ns	0.28	***
	L. pedunculatus	0.72	***	0.12	*	0.46	***
	T. pratense	0.33	***	−0.02	ns	0.48	***
	T. repens	0.46	***	−0.02	ns	0.47	***
	P. lanceolata	0.59	***	0.00	ns	0.39	***
	S. minor	0.74	***	0.22	**	0.20	**
2019	C. carvi	0.23	**	0.09	ns	−0.03	ns
	C. intybus	0.40	***	0.34	***	0.01	ns
	L. corniculatus Leo	0.74	***	0.39	***	0.00	ns
	T. pratense	−0.01	ns	0.11	ns	0.23	**
	T. repens	0.69	***	0.02	ns	0.27	**
	P. lanceolata	0.25	**	0.17	**	−0.03	ns