Table 2
In vitro fermentation constants, degradability and methane production of different forages

Attributes	Vigna sinensis Hay	Acacia nilotica leaves	Ziziphus nummularia leaves	SEM	Significance (P value)
Fermentation kinetics
Potential gas production (ml/200 mg DM)	42.1	40.9	37.9	0.926	0.021
Rate constant (c)	0.044	0.061	0.049	0.005	0.001
Half time (t1/2, h)	15.6	11.4	14.0	0.71	0.018
Lag phase(L, h)	1.90	3.33	5.37	1.16	0.012
Degradability and methane production
DMD %	57.7b	65.0a	54.9c	0.31	< 0.001
OMD %	64.6b	68.8a	60.2c	0.59	< 0.001
Gas production (mL/g)	137b	151a	126c	3.1	< 0.001
Gas production (mL/g DDM)	237a	232ab	229b	2.5	0.024
Gas production (mL/g DOM)	240	250	239	5.2	0.541
Methane production (mL/g DM)	28.4a	12.7c	23.0b	0.95	< 0.001
Methane production (mL/g DDM)	49.1a	19.6c	41.9b	1.36	< 0.001
Methane production (mL/g OMD)	49.8a	22.3c	43.8b	0.70	< 0.001
Partitioning factor (g/mL)	4.16b	3.99a	4.18b	0.038	0.042